2151270 has 96 divisors (see below), whose sum is σ = 6368544. Its totient is φ = 499200.

The previous prime is 2151269. The next prime is 2151271. The reversal of 2151270 is 721512.

It is an interprime number because it is at equal distance from previous prime (2151269) and next prime (2151271).

It is a super-2 number, since 2×2151270² = 9255925225800, which contains 22 as substring.

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 (2151271) 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, 40564 + ... + 40616.

It is an arithmetic number, because the mean of its divisors is an integer number (66339).

2^2151270 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2151270, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3184272).

2151270 is an abundant number, since it is smaller than the sum of its proper divisors (4217274).

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

2151270 is a wasteful number, since it uses less digits than its factorization.

2151270 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118 (or 115 counting only the distinct ones).

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

The square root of 2151270 is about 1466.7208323331. The cubic root of 2151270 is about 129.0916961173.

Adding to 2151270 its reverse (721512), we get a palindrome (2872782).

It can be divided in two parts, 215 and 1270, that added together give a triangular number (1485 = T₅₄).

The spelling of 2151270 in words is "two million, one hundred fifty-one thousand, two hundred seventy".