21151402531351 has 16 divisors (see below), whose sum is σ = 22782632914080. Its totient is φ = 19563396065280.

The previous prime is 21151402531327. The next prime is 21151402531361. The reversal of 21151402531351 is 15313520415112.

It is not a de Polignac number, because 21151402531351 - 2⁵ = 21151402531319 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 (21151402531361) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 374466 + ... + 6514831.

It is an arithmetic number, because the mean of its divisors is an integer number (1423914557130).

Almost surely, 2^{21151402531351} is an apocalyptic number.

21151402531351 is a deficient number, since it is larger than the sum of its proper divisors (1631230382729).

21151402531351 is a wasteful number, since it uses less digits than its factorization.

21151402531351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6892434.

The product of its (nonzero) digits is 18000, while the sum is 34.

Adding to 21151402531351 its reverse (15313520415112), we get a palindrome (36464922946463).

The spelling of 21151402531351 in words is "twenty-one trillion, one hundred fifty-one billion, four hundred two million, five hundred thirty-one thousand, three hundred fifty-one".