21337498396351 has 4 divisors (see below), whose sum is σ = 21359564062672. Its totient is φ = 21315432730032.

The previous prime is 21337498396343. The next prime is 21337498396421. The reversal of 21337498396351 is 15369389473312.

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 21337498396351 - 2³ = 21337498396343 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21337498396321) 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, 11032831710 + ... + 11032833643.

It is an arithmetic number, because the mean of its divisors is an integer number (5339891015668).

Almost surely, 2^{21337498396351} is an apocalyptic number.

21337498396351 is a deficient number, since it is larger than the sum of its proper divisors (22065666321).

21337498396351 is an equidigital number, since it uses as much as digits as its factorization.

21337498396351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22065666320.

The product of its digits is 88179840, while the sum is 64.

The spelling of 21337498396351 in words is "twenty-one trillion, three hundred thirty-seven billion, four hundred ninety-eight million, three hundred ninety-six thousand, three hundred fifty-one".