2161021662 has 24 divisors (see below), whose sum is σ = 4683927456. Its totient is φ = 720076896.

The previous prime is 2161021661. The next prime is 2161021663. The reversal of 2161021662 is 2661201612.

2161021662 is a `hidden beast` number, since 21 + 610 + 21 + 6 + 6 + 2 = 666.

It is an interprime number because it is at equal distance from previous prime (2161021661) and next prime (2161021663).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2161021661) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32178 + ... + 73194.

It is an arithmetic number, because the mean of its divisors is an integer number (195163644).

Almost surely, 2^2161021662 is an apocalyptic number.

2161021662 is an abundant number, since it is smaller than the sum of its proper divisors (2522905794).

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

2161021662 is a wasteful number, since it uses less digits than its factorization.

2161021662 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43952 (or 43949 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 2161021662 is about 46486.7901881814. The cubic root of 2161021662 is about 1292.8645878257.

The spelling of 2161021662 in words is "two billion, one hundred sixty-one million, twenty-one thousand, six hundred sixty-two".