21066364052 has 12 divisors (see below), whose sum is σ = 36878701440. Its totient is φ = 10529592216.

The previous prime is 21066364043. The next prime is 21066364069. The reversal of 21066364052 is 25046366012.

It is a happy number.

It is a congruent number.

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, 884228 + ... + 907739.

It is an arithmetic number, because the mean of its divisors is an integer number (3073225120).

Almost surely, 2^21066364052 is an apocalyptic number.

It is an amenable number.

21066364052 is a deficient number, since it is larger than the sum of its proper divisors (15812337388).

21066364052 is a wasteful number, since it uses less digits than its factorization.

21066364052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1794910 (or 1794908 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The spelling of 21066364052 in words is "twenty-one billion, sixty-six million, three hundred sixty-four thousand, fifty-two".