21070672400 has 30 divisors (see below), whose sum is σ = 50622291402. Its totient is φ = 8428268800.

The previous prime is 21070672387. The next prime is 21070672411. The reversal of 21070672400 is 427607012.

It can be written as a sum of positive squares in 3 ways, for example, as 6199357696 + 14871314704 = 78736^2 + 121948^2 .

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 5 ways as a sum of consecutive naturals, for example, 26337941 + ... + 26338740.

Almost surely, 2^21070672400 is an apocalyptic number.

21070672400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21070672400 is an abundant number, since it is smaller than the sum of its proper divisors (29551619002).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21070672400 is a wasteful number, since it uses less digits than its factorization.

21070672400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52676699 (or 52676688 counting only the distinct ones).

The product of its (nonzero) digits is 4704, while the sum is 29.

The spelling of 21070672400 in words is "twenty-one billion, seventy million, six hundred seventy-two thousand, four hundred".