1021001000120 has 32 divisors (see below), whose sum is σ = 2432384737200. Its totient is φ = 384376846848.

The previous prime is 1021001000111. The next prime is 1021001000143. The reversal of 1021001000120 is 210001001201.

It is a Harshad number since it is a multiple of its sum of digits (8).

It is a junction number, because it is equal to n+sod(n) for n = 1021001000098 and 1021001000107.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 750735350 + ... + 750736709.

Almost surely, 2^{1021001000120} is an apocalyptic number.

1021001000120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021001000120 is an abundant number, since it is smaller than the sum of its proper divisors (1411383737080).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021001000120 is a wasteful number, since it uses less digits than its factorization.

1021001000120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1501472087 (or 1501472083 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 1021001000120 its reverse (210001001201), we get a palindrome (1231002001321).

The spelling of 1021001000120 in words is "one trillion, twenty-one billion, one million, one hundred twenty", and thus it is an aban number.