2131221213120 has 56 divisors (see below), whose sum is σ = 6766627354704. Its totient is φ = 568325656576.

The previous prime is 2131221213103. The next prime is 2131221213131. The reversal of 2131221213120 is 213121221312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1110010089 + ... + 1110012008.

It is an arithmetic number, because the mean of its divisors is an integer number (120832631334).

Almost surely, 2^{2131221213120} is an apocalyptic number.

2131221213120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2131221213120 is an abundant number, since it is smaller than the sum of its proper divisors (4635406141584).

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

2131221213120 is a wasteful number, since it uses less digits than its factorization.

2131221213120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2220022117 (or 2220022107 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 2131221213120 its reverse (213121221312), we get a palindrome (2344342434432).

The spelling of 2131221213120 in words is "two trillion, one hundred thirty-one billion, two hundred twenty-one million, two hundred thirteen thousand, one hundred twenty".