1021020123120 has 40 divisors (see below), whose sum is σ = 3165162382416. Its totient is φ = 272272032768.

The previous prime is 1021020123103. The next prime is 1021020123121. The reversal of 1021020123120 is 213210201201.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 1021020123120.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021020123121) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2127125017 + ... + 2127125496.

Almost surely, 2^{1021020123120} is an apocalyptic number.

1021020123120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021020123120 is an abundant number, since it is smaller than the sum of its proper divisors (2144142259296).

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

1021020123120 is a wasteful number, since it uses less digits than its factorization.

1021020123120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4254250529 (or 4254250523 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1021020123120 its reverse (213210201201), we get a palindrome (1234230324321).

The spelling of 1021020123120 in words is "one trillion, twenty-one billion, twenty million, one hundred twenty-three thousand, one hundred twenty".