21400921396 has 24 divisors (see below), whose sum is σ = 39431168000. Its totient is φ = 10135113984.

The previous prime is 21400921361. The next prime is 21400921429. The reversal of 21400921396 is 69312900412.

It is a congruent number.

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, 361540 + ... + 416548.

Almost surely, 2^21400921396 is an apocalyptic number.

It is an amenable number.

21400921396 is a deficient number, since it is larger than the sum of its proper divisors (18030246604).

21400921396 is a wasteful number, since it uses less digits than its factorization.

21400921396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60151 (or 60149 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The spelling of 21400921396 in words is "twenty-one billion, four hundred million, nine hundred twenty-one thousand, three hundred ninety-six".