51221212215 has 32 divisors (see below), whose sum is σ = 82863820800. Its totient is φ = 27015331200.

The previous prime is 51221212181. The next prime is 51221212223.

51221212215 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 51221212215 - 2⁶ = 51221212151 is a prime.

It is a super-2 number, since 2×51221212215² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1281706 + ... + 1321064.

It is an arithmetic number, because the mean of its divisors is an integer number (2589494400).

Almost surely, 2^51221212215 is an apocalyptic number.

51221212215 is a deficient number, since it is larger than the sum of its proper divisors (31642608585).

51221212215 is a wasteful number, since it uses less digits than its factorization.

51221212215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40327.

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

The spelling of 51221212215 in words is "fifty-one billion, two hundred twenty-one million, two hundred twelve thousand, two hundred fifteen".