2131221130021 has 16 divisors (see below), whose sum is σ = 2247744441600. Its totient is φ = 2015137018368.

The previous prime is 2131221130019. The next prime is 2131221130063. The reversal of 2131221130021 is 1200311221312.

It is not a de Polignac number, because 2131221130021 - 2¹ = 2131221130019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2131221130321) 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, 20422945 + ... + 20527033.

It is an arithmetic number, because the mean of its divisors is an integer number (140484027600).

Almost surely, 2^{2131221130021} is an apocalyptic number.

It is an amenable number.

2131221130021 is a deficient number, since it is larger than the sum of its proper divisors (116523311579).

2131221130021 is a wasteful number, since it uses less digits than its factorization.

2131221130021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106188.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 2131221130021 its reverse (1200311221312), we get a palindrome (3331532351333).

The spelling of 2131221130021 in words is "two trillion, one hundred thirty-one billion, two hundred twenty-one million, one hundred thirty thousand, twenty-one".