21421400313 has 16 divisors (see below), whose sum is σ = 29820211200. Its totient is φ = 13652450064.

The previous prime is 21421400311. The next prime is 21421400323. The reversal of 21421400313 is 31300412412.

It is not a de Polignac number, because 21421400313 - 2¹ = 21421400311 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21421400313.

It is not an unprimeable number, because it can be changed into a prime (21421400311) 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, 40638 + ... + 210936.

It is an arithmetic number, because the mean of its divisors is an integer number (1863763200).

Almost surely, 2^21421400313 is an apocalyptic number.

21421400313 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21421400313 is a deficient number, since it is larger than the sum of its proper divisors (8398810887).

21421400313 is a wasteful number, since it uses less digits than its factorization.

21421400313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172148.

The product of its (nonzero) digits is 576, while the sum is 21.

Adding to 21421400313 its reverse (31300412412), we get a palindrome (52721812725).

The spelling of 21421400313 in words is "twenty-one billion, four hundred twenty-one million, four hundred thousand, three hundred thirteen".