2121312021000 has 64 divisors (see below), whose sum is σ = 6618493514880. Its totient is φ = 565683204800.

The previous prime is 2121312020999. The next prime is 2121312021001. The reversal of 2121312021000 is 1202131212.

It is an interprime number because it is at equal distance from previous prime (2121312020999) and next prime (2121312021001).

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

It is not an unprimeable number, because it can be changed into a prime (2121312021001) 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, 353549004 + ... + 353555003.

It is an arithmetic number, because the mean of its divisors is an integer number (103413961170).

Almost surely, 2^{2121312021000} is an apocalyptic number.

2121312021000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2121312021000 is an abundant number, since it is smaller than the sum of its proper divisors (4497181493880).

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

2121312021000 is a wasteful number, since it uses less digits than its factorization.

2121312021000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 707104031 (or 707104017 counting only the distinct ones).

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

Adding to 2121312021000 its reverse (1202131212), we get a palindrome (2122514152212).

The spelling of 2121312021000 in words is "two trillion, one hundred twenty-one billion, three hundred twelve million, twenty-one thousand".