1215121312020 has 96 divisors (see below), whose sum is σ = 4241878050816. Its totient is φ = 252492739200.

The previous prime is 1215121311967. The next prime is 1215121312051. The reversal of 1215121312020 is 202131215121.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131502016 + ... + 131511255.

It is an arithmetic number, because the mean of its divisors is an integer number (44186229696).

Almost surely, 2^{1215121312020} is an apocalyptic number.

1215121312020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1215121312020 is an abundant number, since it is smaller than the sum of its proper divisors (3026756738796).

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

1215121312020 is a wasteful number, since it uses less digits than its factorization.

1215121312020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263013301 (or 263013299 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

Adding to 1215121312020 its reverse (202131215121), we get a palindrome (1417252527141).

The spelling of 1215121312020 in words is "one trillion, two hundred fifteen billion, one hundred twenty-one million, three hundred twelve thousand, twenty".