21201080176738 has 16 divisors (see below), whose sum is σ = 39648773317824. Its totient is φ = 8260161107760.

The previous prime is 21201080176663. The next prime is 21201080176769. The reversal of 21201080176738 is 83767108010212.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68834675745 + ... + 68834676052.

It is an arithmetic number, because the mean of its divisors is an integer number (2478048332364).

Almost surely, 2^{21201080176738} is an apocalyptic number.

21201080176738 is a deficient number, since it is larger than the sum of its proper divisors (18447693141086).

21201080176738 is a wasteful number, since it uses less digits than its factorization.

21201080176738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137669351817.

The product of its (nonzero) digits is 225792, while the sum is 46.

The spelling of 21201080176738 in words is "twenty-one trillion, two hundred one billion, eighty million, one hundred seventy-six thousand, seven hundred thirty-eight".