2190015621 has 6 divisors (see below), whose sum is σ = 3163355910. Its totient is φ = 1460010408.

The previous prime is 2190015571. The next prime is 2190015637. The reversal of 2190015621 is 1265100912.

2190015621 is a `hidden beast` number, since 21 + 9 + 0 + 0 + 15 + 621 = 666.

It can be written as a sum of positive squares in only one way, i.e., 2188836225 + 1179396 = 46785^2 + 1086^2 .

It is not a de Polignac number, because 2190015621 - 2⁶ = 2190015557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2190015721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 121667526 + ... + 121667543.

It is an arithmetic number, because the mean of its divisors is an integer number (527225985).

Almost surely, 2^2190015621 is an apocalyptic number.

It is an amenable number.

2190015621 is a deficient number, since it is larger than the sum of its proper divisors (973340289).

2190015621 is a wasteful number, since it uses less digits than its factorization.

2190015621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243335075 (or 243335072 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 27.

The square root of 2190015621 is about 46797.6027270628. The cubic root of 2190015621 is about 1298.6209480600.

The spelling of 2190015621 in words is "two billion, one hundred ninety million, fifteen thousand, six hundred twenty-one".