21348657951 has 32 divisors (see below), whose sum is σ = 30299728320. Its totient is φ = 13348608000.

The previous prime is 21348657943. The next prime is 21348657959. The reversal of 21348657951 is 15975684312.

It is an interprime number because it is at equal distance from previous prime (21348657943) and next prime (21348657959).

It is not a de Polignac number, because 21348657951 - 2³ = 21348657943 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21348657894 and 21348657903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21348657959) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 442791 + ... + 488631.

It is an arithmetic number, because the mean of its divisors is an integer number (946866510).

Almost surely, 2^21348657951 is an apocalyptic number.

21348657951 is a deficient number, since it is larger than the sum of its proper divisors (8951070369).

21348657951 is a wasteful number, since it uses less digits than its factorization.

21348657951 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46027.

The product of its digits is 1814400, while the sum is 51.

The spelling of 21348657951 in words is "twenty-one billion, three hundred forty-eight million, six hundred fifty-seven thousand, nine hundred fifty-one".