51212221215 has 8 divisors (see below), whose sum is σ = 81939553968. Its totient is φ = 27313184640.

The previous prime is 51212221211. The next prime is 51212221223.

51212221215 is nontrivially palindromic in base 10.

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

It is not a de Polignac number, because 51212221215 - 2² = 51212221211 is a prime.

It is a super-3 number, since 3×51212221215³ (a number of 33 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51212221211) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1707074026 + ... + 1707074055.

It is an arithmetic number, because the mean of its divisors is an integer number (10242444246).

Almost surely, 2^51212221215 is an apocalyptic number.

51212221215 is a deficient number, since it is larger than the sum of its proper divisors (30727332753).

51212221215 is a wasteful number, since it uses less digits than its factorization.

51212221215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3414148089.

The product of its digits is 800, while the sum is 24.

The spelling of 51212221215 in words is "fifty-one billion, two hundred twelve million, two hundred twenty-one thousand, two hundred fifteen".