1021987776044 has 12 divisors (see below), whose sum is σ = 1791242876304. Its totient is φ = 510204097104.

The previous prime is 1021987776041. The next prime is 1021987776097. The reversal of 1021987776044 is 4406777891201.

It is a super-2 number, since 2×1021987776044² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1021987776041) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197444819 + ... + 197449994.

It is an arithmetic number, because the mean of its divisors is an integer number (149270239692).

Almost surely, 2^{1021987776044} is an apocalyptic number.

It is an amenable number.

1021987776044 is a deficient number, since it is larger than the sum of its proper divisors (769255100260).

1021987776044 is a wasteful number, since it uses less digits than its factorization.

1021987776044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394895464 (or 394895462 counting only the distinct ones).

The product of its (nonzero) digits is 4741632, while the sum is 56.

The spelling of 1021987776044 in words is "one trillion, twenty-one billion, nine hundred eighty-seven million, seven hundred seventy-six thousand, forty-four".