1221012109977 has 8 divisors (see below), whose sum is σ = 1776017614560. Its totient is φ = 740007339360.

The previous prime is 1221012109973. The next prime is 1221012109979. The reversal of 1221012109977 is 7799012101221.

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

It is not a de Polignac number, because 1221012109977 - 2² = 1221012109973 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1221012109973) 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, 18500183452 + ... + 18500183517.

It is an arithmetic number, because the mean of its divisors is an integer number (222002201820).

Almost surely, 2^{1221012109977} is an apocalyptic number.

It is an amenable number.

1221012109977 is a deficient number, since it is larger than the sum of its proper divisors (555005504583).

1221012109977 is a wasteful number, since it uses less digits than its factorization.

1221012109977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37000366983.

The product of its (nonzero) digits is 31752, while the sum is 42.

The spelling of 1221012109977 in words is "one trillion, two hundred twenty-one billion, twelve million, one hundred nine thousand, nine hundred seventy-seven".