21119670 has 128 divisors (see below), whose sum is σ = 66286080. Its totient is φ = 4717440.

The previous prime is 21119669. The next prime is 21119677. The reversal of 21119670 is 7691112.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21119677) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 38337 + ... + 38883.

It is an arithmetic number, because the mean of its divisors is an integer number (517860).

Almost surely, 2^21119670 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21119670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33143040).

21119670 is an abundant number, since it is smaller than the sum of its proper divisors (45166410).

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

21119670 is a wasteful number, since it uses less digits than its factorization.

21119670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 587 (or 581 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The square root of 21119670 is about 4595.6142135736. The cubic root of 21119670 is about 276.4154895214.

It can be divided in two parts, 2111 and 9670, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 21119670 in words is "twenty-one million, one hundred nineteen thousand, six hundred seventy".