21262410212 has 12 divisors (see below), whose sum is σ = 37228928940. Its totient is φ = 10625573376.

The previous prime is 21262410179. The next prime is 21262410271. The reversal of 21262410212 is 21201426212.

It can be written as a sum of positive squares in 2 ways, for example, as 9620863396 + 11641546816 = 98086^2 + 107896^2 .

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, 1399433 + ... + 1414544.

It is an arithmetic number, because the mean of its divisors is an integer number (3102410745).

Almost surely, 2^21262410212 is an apocalyptic number.

It is an amenable number.

21262410212 is a deficient number, since it is larger than the sum of its proper divisors (15966518728).

21262410212 is a wasteful number, since it uses less digits than its factorization.

21262410212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2815870 (or 2815868 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 21262410212 its reverse (21201426212), we get a palindrome (42463836424).

The spelling of 21262410212 in words is "twenty-one billion, two hundred sixty-two million, four hundred ten thousand, two hundred twelve".