215021070 has 96 divisors (see below), whose sum is σ = 624184704. Its totient is φ = 50904000.

The previous prime is 215021069. The next prime is 215021071. The reversal of 215021070 is 70120512.

215021070 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (215021069) and next prime (215021071).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215021071) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 40045 + ... + 45095.

It is an arithmetic number, because the mean of its divisors is an integer number (6501924).

Almost surely, 2^215021070 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215021070, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (312092352).

215021070 is an abundant number, since it is smaller than the sum of its proper divisors (409163634).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215021070 is a wasteful number, since it uses less digits than its factorization.

215021070 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5118 (or 5115 counting only the distinct ones).

The product of its (nonzero) digits is 140, while the sum is 18.

The square root of 215021070 is about 14663.5967620499. The cubic root of 215021070 is about 599.0922105566.

Adding to 215021070 its reverse (70120512), we get a palindrome (285141582).

It can be divided in two parts, 2150 and 21070, that added together give a triangular number (23220 = T₂₁₅).

The spelling of 215021070 in words is "two hundred fifteen million, twenty-one thousand, seventy".