21313001421 has 16 divisors (see below), whose sum is σ = 31763894400. Its totient is φ = 14123582784.

The previous prime is 21313001419. The next prime is 21313001447. The reversal of 21313001421 is 12410031312.

21313001421 is a `hidden beast` number, since 213 + 1 + 30 + 0 + 1 + 421 = 666.

It is not a de Polignac number, because 21313001421 - 2¹ = 21313001419 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21313001394 and 21313001403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21313001401) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2358876 + ... + 2367893.

It is an arithmetic number, because the mean of its divisors is an integer number (1985243400).

Almost surely, 2^21313001421 is an apocalyptic number.

It is an amenable number.

21313001421 is a deficient number, since it is larger than the sum of its proper divisors (10450892979).

21313001421 is a wasteful number, since it uses less digits than its factorization.

21313001421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4726945 (or 4726939 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 21313001421 its reverse (12410031312), we get a palindrome (33723032733).

The spelling of 21313001421 in words is "twenty-one billion, three hundred thirteen million, one thousand, four hundred twenty-one".