21421254315 has 32 divisors (see below), whose sum is σ = 35252997120. Its totient is φ = 11101095936.

The previous prime is 21421254307. The next prime is 21421254353. The reversal of 21421254315 is 51345212412.

It is not a de Polignac number, because 21421254315 - 2³ = 21421254307 is a prime.

It is a super-2 number, since 2×21421254315² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 38446 + ... + 210524.

It is an arithmetic number, because the mean of its divisors is an integer number (1101656160).

Almost surely, 2^21421254315 is an apocalyptic number.

21421254315 is a deficient number, since it is larger than the sum of its proper divisors (13831742805).

21421254315 is a wasteful number, since it uses less digits than its factorization.

21421254315 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 172323.

The product of its digits is 9600, while the sum is 30.

Adding to 21421254315 its reverse (51345212412), we get a palindrome (72766466727).

The spelling of 21421254315 in words is "twenty-one billion, four hundred twenty-one million, two hundred fifty-four thousand, three hundred fifteen".