21374443203251 has 4 divisors (see below), whose sum is σ = 21374481189600. Its totient is φ = 21374405216904.

The previous prime is 21374443203101. The next prime is 21374443203263. The reversal of 21374443203251 is 15230234447312.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21374443203251 - 2²⁶ = 21374376094387 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21374443203199 and 21374443203208.

It is not an unprimeable number, because it can be changed into a prime (21374443283251) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18136256 + ... + 19278813.

It is an arithmetic number, because the mean of its divisors is an integer number (5343620297400).

Almost surely, 2^{21374443203251} is an apocalyptic number.

21374443203251 is a deficient number, since it is larger than the sum of its proper divisors (37986349).

21374443203251 is an equidigital number, since it uses as much as digits as its factorization.

21374443203251 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37986348.

The product of its (nonzero) digits is 483840, while the sum is 41.

The spelling of 21374443203251 in words is "twenty-one trillion, three hundred seventy-four billion, four hundred forty-three million, two hundred three thousand, two hundred fifty-one".