21130055252351 has 4 divisors (see below), whose sum is σ = 21131684790672. Its totient is φ = 21128425714032.

The previous prime is 21130055252347. The next prime is 21130055252399. The reversal of 21130055252351 is 15325255003112.

It is a happy number.

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 21130055252351 - 2² = 21130055252347 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 (21130055222351) 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, 814749710 + ... + 814775643.

It is an arithmetic number, because the mean of its divisors is an integer number (5282921197668).

Almost surely, 2^{21130055252351} is an apocalyptic number.

21130055252351 is a deficient number, since it is larger than the sum of its proper divisors (1629538321).

21130055252351 is a wasteful number, since it uses less digits than its factorization.

21130055252351 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1629538320.

The product of its (nonzero) digits is 45000, while the sum is 35.

The spelling of 21130055252351 in words is "twenty-one trillion, one hundred thirty billion, fifty-five million, two hundred fifty-two thousand, three hundred fifty-one".