1021210121120 has 72 divisors (see below), whose sum is σ = 2806504265124. Its totient is φ = 350129181696.

The previous prime is 1021210121111. The next prime is 1021210121123. The reversal of 1021210121120 is 211210121201.

It can be written as a sum of positive squares in 2 ways, for example, as 951803164816 + 69406956304 = 975604^2 + 263452^2 .

It is a super-2 number, since 2×1021210121120² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (14).

It is a junction number, because it is equal to n+sod(n) for n = 1021210121095 and 1021210121104.

It is not an unprimeable number, because it can be changed into a prime (1021210121123) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 65120357 + ... + 65136036.

Almost surely, 2^{1021210121120} is an apocalyptic number.

1021210121120 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021210121120 is an abundant number, since it is smaller than the sum of its proper divisors (1785294144004).

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

1021210121120 is a wasteful number, since it uses less digits than its factorization.

1021210121120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130256422 (or 130256407 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1021210121120 its reverse (211210121201), we get a palindrome (1232420242321).

The spelling of 1021210121120 in words is "one trillion, twenty-one billion, two hundred ten million, one hundred twenty-one thousand, one hundred twenty".