21066762512 has 10 divisors (see below), whose sum is σ = 40816852398. Its totient is φ = 10533381248.

The previous prime is 21066762503. The next prime is 21066762527. The reversal of 21066762512 is 21526766012.

It can be written as a sum of positive squares in only one way, i.e., 11454136576 + 9612625936 = 107024^2 + 98044^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 658336313 + ... + 658336344.

Almost surely, 2^21066762512 is an apocalyptic number.

It is an amenable number.

21066762512 is a deficient number, since it is larger than the sum of its proper divisors (19750089886).

21066762512 is a wasteful number, since it uses less digits than its factorization.

21066762512 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1316672665 (or 1316672659 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The spelling of 21066762512 in words is "twenty-one billion, sixty-six million, seven hundred sixty-two thousand, five hundred twelve".