1021121200990 has 24 divisors (see below), whose sum is σ = 2020300957080. Its totient is φ = 371316799920.

The previous prime is 1021121200933. The next prime is 1021121200991. The reversal of 1021121200990 is 990021211201.

It is a super-2 number, since 2×1021121200990² (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 (1021121200991) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 421949700 + ... + 421952119.

It is an arithmetic number, because the mean of its divisors is an integer number (84179206545).

Almost surely, 2^{1021121200990} is an apocalyptic number.

1021121200990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1021121200990 is a deficient number, since it is larger than the sum of its proper divisors (999179756090).

1021121200990 is a wasteful number, since it uses less digits than its factorization.

1021121200990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 843901848 (or 843901837 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 1021121200990 in words is "one trillion, twenty-one billion, one hundred twenty-one million, two hundred thousand, nine hundred ninety".