21670052 has 12 divisors (see below), whose sum is σ = 38457216. Its totient is φ = 10682280.

The previous prime is 21670037. The next prime is 21670063. The reversal of 21670052 is 25007612.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37868 + ... + 38435.

It is an arithmetic number, because the mean of its divisors is an integer number (3204768).

Almost surely, 2^21670052 is an apocalyptic number.

It is an amenable number.

21670052 is a deficient number, since it is larger than the sum of its proper divisors (16787164).

21670052 is a wasteful number, since it uses less digits than its factorization.

21670052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76378 (or 76376 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 21670052 is about 4655.1103101860. The cubic root of 21670052 is about 278.7960723380.

Adding to 21670052 its reverse (25007612), we get a palindrome (46677664).

The spelling of 21670052 in words is "twenty-one million, six hundred seventy thousand, fifty-two".