21202012 has 24 divisors (see below), whose sum is σ = 40127472. Its totient is φ = 9744000.

The previous prime is 21202003. The next prime is 21202033. The reversal of 21202012 is 21020212.

It is a self number, because there is not a number n which added to its sum of digits gives 21202012.

It is a congruent number.

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, 13887 + ... + 15337.

It is an arithmetic number, because the mean of its divisors is an integer number (1671978).

Almost surely, 2^21202012 is an apocalyptic number.

It is an amenable number.

21202012 is a deficient number, since it is larger than the sum of its proper divisors (18925460).

21202012 is a wasteful number, since it uses less digits than its factorization.

21202012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1749 (or 1747 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

The square root of 21202012 is about 4604.5642573429. The cubic root of 21202012 is about 276.7742559895.

Adding to 21202012 its reverse (21020212), we get a palindrome (42222224).

The spelling of 21202012 in words is "twenty-one million, two hundred two thousand, twelve".