2113437921 has 16 divisors (see below), whose sum is σ = 3227387904. Its totient is φ = 1205087184.

The previous prime is 2113437919. The next prime is 2113437929. The reversal of 2113437921 is 1297343112.

It is not a de Polignac number, because 2113437921 - 2¹ = 2113437919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2113437929) 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, 97945 + ... + 117558.

It is an arithmetic number, because the mean of its divisors is an integer number (201711744).

Almost surely, 2^2113437921 is an apocalyptic number.

2113437921 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2113437921 is a deficient number, since it is larger than the sum of its proper divisors (1113949983).

2113437921 is a wasteful number, since it uses less digits than its factorization.

2113437921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 215980.

The product of its digits is 9072, while the sum is 33.

The square root of 2113437921 is about 45972.1428802269. The cubic root of 2113437921 is about 1283.3048389843.

The spelling of 2113437921 in words is "two billion, one hundred thirteen million, four hundred thirty-seven thousand, nine hundred twenty-one".