21061400738 has 16 divisors (see below), whose sum is σ = 36107385984. Its totient is φ = 9025782720.

The previous prime is 21061400719. The next prime is 21061400749. The reversal of 21061400738 is 83700416012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 287306 + ... + 353082.

It is an arithmetic number, because the mean of its divisors is an integer number (2256711624).

Almost surely, 2^21061400738 is an apocalyptic number.

21061400738 is a deficient number, since it is larger than the sum of its proper divisors (15045985246).

21061400738 is a wasteful number, since it uses less digits than its factorization.

21061400738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88657.

The product of its (nonzero) digits is 8064, while the sum is 32.

The spelling of 21061400738 in words is "twenty-one billion, sixty-one million, four hundred thousand, seven hundred thirty-eight".