21572034 has 32 divisors (see below), whose sum is σ = 47234880. Its totient is φ = 6513600.

The previous prime is 21572003. The next prime is 21572041. The reversal of 21572034 is 43027512.

It is a junction number, because it is equal to n+sod(n) for n = 21571995 and 21572013.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30072 + ... + 30780.

It is an arithmetic number, because the mean of its divisors is an integer number (1476090).

Almost surely, 2^21572034 is an apocalyptic number.

21572034 is an abundant number, since it is smaller than the sum of its proper divisors (25662846).

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

21572034 is a wasteful number, since it uses less digits than its factorization.

21572034 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1186.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 21572034 is about 4644.5703784096. The cubic root of 21572034 is about 278.3750867438.

Adding to 21572034 its reverse (43027512), we get a palindrome (64599546).

The spelling of 21572034 in words is "twenty-one million, five hundred seventy-two thousand, thirty-four".