2015622421 has 4 divisors (see below), whose sum is σ = 2018988000. Its totient is φ = 2012256844.

The previous prime is 2015622419. The next prime is 2015622431. The reversal of 2015622421 is 1242265102.

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 2015622421 - 2¹ = 2015622419 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2015622431) 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, 1681891 + ... + 1683088.

It is an arithmetic number, because the mean of its divisors is an integer number (504747000).

Almost surely, 2^2015622421 is an apocalyptic number.

It is an amenable number.

2015622421 is a deficient number, since it is larger than the sum of its proper divisors (3365579).

2015622421 is an equidigital number, since it uses as much as digits as its factorization.

2015622421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3365578.

The product of its (nonzero) digits is 1920, while the sum is 25.

The square root of 2015622421 is about 44895.6837680417. The cubic root of 2015622421 is about 1263.1930480482.

Adding to 2015622421 its reverse (1242265102), we get a palindrome (3257887523).

The spelling of 2015622421 in words is "two billion, fifteen million, six hundred twenty-two thousand, four hundred twenty-one".