1021990557412 has 48 divisors (see below), whose sum is σ = 1955732292864. Its totient is φ = 463432644000.

The previous prime is 1021990557409. The next prime is 1021990557431. The reversal of 1021990557412 is 2147550991201.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 54552087 + ... + 54570817.

It is an arithmetic number, because the mean of its divisors is an integer number (40744422768).

Almost surely, 2^{1021990557412} is an apocalyptic number.

It is an amenable number.

1021990557412 is a deficient number, since it is larger than the sum of its proper divisors (933741735452).

1021990557412 is a wasteful number, since it uses less digits than its factorization.

1021990557412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21640 (or 21638 counting only the distinct ones).

The product of its (nonzero) digits is 226800, while the sum is 46.

The spelling of 1021990557412 in words is "one trillion, twenty-one billion, nine hundred ninety million, five hundred fifty-seven thousand, four hundred twelve".