511221211212 has 48 divisors (see below), whose sum is σ = 1234057476960. Its totient is φ = 164520932352.

The previous prime is 511221211157. The next prime is 511221211223. The reversal of 511221211212 is 212112122115.

It is a super-2 number, since 2×511221211212² (a number of 24 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7488738 + ... + 7556694.

It is an arithmetic number, because the mean of its divisors is an integer number (25709530770).

Almost surely, 2^511221211212 is an apocalyptic number.

It is an amenable number.

511221211212 is an abundant number, since it is smaller than the sum of its proper divisors (722836265748).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

511221211212 is a wasteful number, since it uses less digits than its factorization.

511221211212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89610 (or 89608 counting only the distinct ones).

The product of its digits is 160, while the sum is 21.

Adding to 511221211212 its reverse (212112122115), we get a palindrome (723333333327).

The spelling of 511221211212 in words is "five hundred eleven billion, two hundred twenty-one million, two hundred eleven thousand, two hundred twelve".