1210021200021 has 64 divisors (see below), whose sum is σ = 1669431617280. Its totient is φ = 779317862400.

The previous prime is 1210021199969. The next prime is 1210021200083. The reversal of 1210021200021 is 1200021200121.

It is not a de Polignac number, because 1210021200021 - 2⁹ = 1210021199509 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1210021202021) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1269696481 + ... + 1269697433.

It is an arithmetic number, because the mean of its divisors is an integer number (26084869020).

Almost surely, 2^{1210021200021} is an apocalyptic number.

It is an amenable number.

1210021200021 is a deficient number, since it is larger than the sum of its proper divisors (459410417259).

1210021200021 is a wasteful number, since it uses less digits than its factorization.

1210021200021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1686.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 1210021200021 its reverse (1200021200121), we get a palindrome (2410042400142).

The spelling of 1210021200021 in words is "one trillion, two hundred ten billion, twenty-one million, two hundred thousand, twenty-one".