1221817077031 has 16 divisors (see below), whose sum is σ = 1321460120160. Its totient is φ = 1125735045120.

The previous prime is 1221817077001. The next prime is 1221817077043. The reversal of 1221817077031 is 1307707181221.

It is a cyclic number.

It is not a de Polignac number, because 1221817077031 - 2¹⁷ = 1221816945959 is a prime.

It is a super-2 number, since 2×1221817077031² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221817077001) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1236471 + ... + 1993111.

It is an arithmetic number, because the mean of its divisors is an integer number (82591257510).

Almost surely, 2^{1221817077031} is an apocalyptic number.

1221817077031 is a deficient number, since it is larger than the sum of its proper divisors (99643043129).

1221817077031 is a wasteful number, since it uses less digits than its factorization.

1221817077031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 758994.

The product of its (nonzero) digits is 32928, while the sum is 40.

The spelling of 1221817077031 in words is "one trillion, two hundred twenty-one billion, eight hundred seventeen million, seventy-seven thousand, thirty-one".