2161221150 has 48 divisors (see below), whose sum is σ = 5847090048. Its totient is φ = 523932000.

The previous prime is 2161221133. The next prime is 2161221191. The reversal of 2161221150 is 511221612.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 653266 + ... + 656565.

It is an arithmetic number, because the mean of its divisors is an integer number (121814376).

Almost surely, 2^2161221150 is an apocalyptic number.

2161221150 is an abundant number, since it is smaller than the sum of its proper divisors (3685868898).

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

2161221150 is a wasteful number, since it uses less digits than its factorization.

2161221150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1309857 (or 1309852 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 21.

The square root of 2161221150 is about 46488.9357804629. The cubic root of 2161221150 is about 1292.9043688607.

Adding to 2161221150 its reverse (511221612), we get a palindrome (2672442762).

The spelling of 2161221150 in words is "two billion, one hundred sixty-one million, two hundred twenty-one thousand, one hundred fifty".