21200421312 has 168 divisors, whose sum is σ = 73103638400. Its totient is φ = 5738439168.

The previous prime is 21200421289. The next prime is 21200421317. The reversal of 21200421312 is 21312400212.

It is a happy number.

21200421312 is a `hidden beast` number, since 212 + 0 + 0 + 421 + 31 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (168).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200421317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 61762 + ... + 214977.

Almost surely, 2^21200421312 is an apocalyptic number.

It is an amenable number.

21200421312 is an abundant number, since it is smaller than the sum of its proper divisors (51903217088).

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

21200421312 is a wasteful number, since it uses less digits than its factorization.

21200421312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276783 (or 276770 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

Adding to 21200421312 its reverse (21312400212), we get a palindrome (42512821524).

The spelling of 21200421312 in words is "twenty-one billion, two hundred million, four hundred twenty-one thousand, three hundred twelve".