1210121011020 has 48 divisors (see below), whose sum is σ = 3388789420128. Its totient is φ = 322656023040.

The previous prime is 1210121011007. The next prime is 1210121011031. The reversal of 1210121011020 is 201101210121.

It is a super-2 number, since 2×1210121011020² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is a junction number, because it is equal to n+sod(n) for n = 1210121010987 and 1210121011005.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 884809 + ... + 1789728.

It is an arithmetic number, because the mean of its divisors is an integer number (70599779586).

Almost surely, 2^{1210121011020} is an apocalyptic number.

1210121011020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1210121011020 is an abundant number, since it is smaller than the sum of its proper divisors (2178668409108).

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

1210121011020 is a wasteful number, since it uses less digits than its factorization.

1210121011020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2682090 (or 2682088 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1210121011020 its reverse (201101210121), we get a palindrome (1411222221141).

The spelling of 1210121011020 in words is "one trillion, two hundred ten billion, one hundred twenty-one million, eleven thousand, twenty".