1021120099965 has 48 divisors (see below), whose sum is σ = 2022892679808. Its totient is φ = 466774132608.

The previous prime is 1021120099957. The next prime is 1021120100009. The reversal of 1021120099965 is 5699900211201.

It is not a de Polignac number, because 1021120099965 - 2³ = 1021120099957 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 1021120099965.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 7165942 + ... + 7307048.

It is an arithmetic number, because the mean of its divisors is an integer number (42143597496).

Almost surely, 2^{1021120099965} is an apocalyptic number.

1021120099965 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1021120099965 is a deficient number, since it is larger than the sum of its proper divisors (1001772579843).

1021120099965 is a wasteful number, since it uses less digits than its factorization.

1021120099965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164098 (or 164095 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The spelling of 1021120099965 in words is "one trillion, twenty-one billion, one hundred twenty million, ninety-nine thousand, nine hundred sixty-five".