21261023314351 has 8 divisors (see below), whose sum is σ = 21278978543664. Its totient is φ = 21243070243200.

The previous prime is 21261023314303. The next prime is 21261023314393. The reversal of 21261023314351 is 15341332016212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21261023314351 is a prime.

It is a super-2 number, since 2×21261023314351² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21261023314651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19484985 + ... + 20547181.

It is an arithmetic number, because the mean of its divisors is an integer number (2659872317958).

Almost surely, 2^{21261023314351} is an apocalyptic number.

21261023314351 is a deficient number, since it is larger than the sum of its proper divisors (17955229313).

21261023314351 is a wasteful number, since it uses less digits than its factorization.

21261023314351 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079081.

The product of its (nonzero) digits is 25920, while the sum is 34.

The spelling of 21261023314351 in words is "twenty-one trillion, two hundred sixty-one billion, twenty-three million, three hundred fourteen thousand, three hundred fifty-one".