21415234 has 16 divisors (see below), whose sum is σ = 33336576. Its totient is φ = 10306800.

The previous prime is 21415217. The next prime is 21415249. The reversal of 21415234 is 43251412.

It is a super-2 number, since 2×21415234² = 917224494549512, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12264 + ... + 13900.

It is an arithmetic number, because the mean of its divisors is an integer number (2083536).

Almost surely, 2^21415234 is an apocalyptic number.

21415234 is a deficient number, since it is larger than the sum of its proper divisors (11921342).

21415234 is a wasteful number, since it uses less digits than its factorization.

21415234 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1881.

The product of its digits is 960, while the sum is 22.

The square root of 21415234 is about 4627.6596676938. The cubic root of 21415234 is about 277.6989737110.

Adding to 21415234 its reverse (43251412), we get a palindrome (64666646).

The spelling of 21415234 in words is "twenty-one million, four hundred fifteen thousand, two hundred thirty-four".