1021210121020 has 48 divisors (see below), whose sum is σ = 2176986913920. Its totient is φ = 402319719936.

The previous prime is 1021210120967. The next prime is 1021210121027. The reversal of 1021210121020 is 201210121201.

It is a super-2 number, since 2×1021210121020² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021210121027) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 541869 + ... + 1528411.

It is an arithmetic number, because the mean of its divisors is an integer number (45353894040).

Almost surely, 2^{1021210121020} is an apocalyptic number.

1021210121020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1021210121020 is an abundant number, since it is smaller than the sum of its proper divisors (1155776792900).

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

1021210121020 is a wasteful number, since it uses less digits than its factorization.

1021210121020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 987334 (or 987332 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 1021210121020 its reverse (201210121201), we get a palindrome (1222420242221).

The spelling of 1021210121020 in words is "one trillion, twenty-one billion, two hundred ten million, one hundred twenty-one thousand, twenty".