2140623521 has 4 divisors (see below), whose sum is σ = 2140897200. Its totient is φ = 2140349844.

The previous prime is 2140623509. The next prime is 2140623553. The reversal of 2140623521 is 1253260412.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2140623521 - 2¹⁴ = 2140607137 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2140643521) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 124751 + ... + 140868.

It is an arithmetic number, because the mean of its divisors is an integer number (535224300).

Almost surely, 2^2140623521 is an apocalyptic number.

It is an amenable number.

2140623521 is a deficient number, since it is larger than the sum of its proper divisors (273679).

2140623521 is an equidigital number, since it uses as much as digits as its factorization.

2140623521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 273678.

The product of its (nonzero) digits is 2880, while the sum is 26.

The square root of 2140623521 is about 46266.8728249490. The cubic root of 2140623521 is about 1288.7838870534.

Adding to 2140623521 its reverse (1253260412), we get a palindrome (3393883933).

The spelling of 2140623521 in words is "two billion, one hundred forty million, six hundred twenty-three thousand, five hundred twenty-one".