21460156 has 6 divisors (see below), whose sum is σ = 37555280. Its totient is φ = 10730076.

The previous prime is 21460147. The next prime is 21460157. The reversal of 21460156 is 65106412.

It is a self number, because there is not a number n which added to its sum of digits gives 21460156.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21460157) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2682516 + ... + 2682523.

Almost surely, 2^21460156 is an apocalyptic number.

It is an amenable number.

21460156 is a deficient number, since it is larger than the sum of its proper divisors (16095124).

21460156 is a wasteful number, since it uses less digits than its factorization.

21460156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5365043 (or 5365041 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 21460156 is about 4632.5107663124. The cubic root of 21460156 is about 277.8930112950.

Adding to 21460156 its reverse (65106412), we get a palindrome (86566568).

The spelling of 21460156 in words is "twenty-one million, four hundred sixty thousand, one hundred fifty-six".