21347365112451 has 96 divisors (see below), whose sum is σ = 38411036697600. Its totient is φ = 11661316571520.

The previous prime is 21347365112449. The next prime is 21347365112467. The reversal of 21347365112451 is 15421156374312.

21347365112451 is a `hidden beast` number, since 2 + 1 + 3 + 47 + 365 + 1 + 1 + 245 + 1 = 666.

It is not a de Polignac number, because 21347365112451 - 2¹ = 21347365112449 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21347365112397 and 21347365112406.

It is not an unprimeable number, because it can be changed into a prime (21347365112431) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 52164490 + ... + 52572128.

It is an arithmetic number, because the mean of its divisors is an integer number (400114965600).

Almost surely, 2^{21347365112451} is an apocalyptic number.

21347365112451 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21347365112451 is a deficient number, since it is larger than the sum of its proper divisors (17063671585149).

21347365112451 is a wasteful number, since it uses less digits than its factorization.

21347365112451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 409406 (or 409393 counting only the distinct ones).

The product of its digits is 604800, while the sum is 45.

The spelling of 21347365112451 in words is "twenty-one trillion, three hundred forty-seven billion, three hundred sixty-five million, one hundred twelve thousand, four hundred fifty-one".