212991315785283 has 128 divisors (see below), whose sum is σ = 358668288000000. Its totient is φ = 109680751724544.

The previous prime is 212991315785243. The next prime is 212991315785317. The reversal of 212991315785283 is 382587513199212.

It is a Cunningham number, because it is equal to 14594222²-1.

It is not a de Polignac number, because 212991315785283 - 2⁶ = 212991315785219 is a prime.

It is a super-2 number, since 2×212991315785283² (a number of 29 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (212991315785233) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 422980843 + ... + 423484091.

It is an arithmetic number, because the mean of its divisors is an integer number (2802096000000).

Almost surely, 2^{212991315785283} is an apocalyptic number.

212991315785283 is a deficient number, since it is larger than the sum of its proper divisors (145676972214717).

212991315785283 is a wasteful number, since it uses less digits than its factorization.

212991315785283 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503849.

The product of its digits is 65318400, while the sum is 66.

The spelling of 212991315785283 in words is "two hundred twelve trillion, nine hundred ninety-one billion, three hundred fifteen million, seven hundred eighty-five thousand, two hundred eighty-three".