21416074690251 has 8 divisors (see below), whose sum is σ = 28555380824464. Its totient is φ = 14277075841440.

The previous prime is 21416074690247. The next prime is 21416074690253. The reversal of 21416074690251 is 15209647061412.

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

It is not a de Polignac number, because 21416074690251 - 2² = 21416074690247 is a prime.

It is the 4627751-st Hogben number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21416074690251.

It is not an unprimeable number, because it can be changed into a prime (21416074690253) by changing a digit.

It is a nontrivial repunit in base 4627750.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76658680 + ... + 76937541.

It is an arithmetic number, because the mean of its divisors is an integer number (3569422603058).

Almost surely, 2^{21416074690251} is an apocalyptic number.

21416074690251 is a deficient number, since it is larger than the sum of its proper divisors (7139306134213).

21416074690251 is a wasteful number, since it uses less digits than its factorization.

21416074690251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153642701.

The product of its (nonzero) digits is 725760, while the sum is 48.

The spelling of 21416074690251 in words is "twenty-one trillion, four hundred sixteen billion, seventy-four million, six hundred ninety thousand, two hundred fifty-one".