2101221650 has 48 divisors (see below), whose sum is σ = 4268833920. Its totient is φ = 763137600.

The previous prime is 2101221631. The next prime is 2101221653. The reversal of 2101221650 is 561221012.

It is not an unprimeable number, because it can be changed into a prime (2101221653) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 569612 + ... + 573288.

It is an arithmetic number, because the mean of its divisors is an integer number (88934040).

Almost surely, 2^2101221650 is an apocalyptic number.

2101221650 is an abundant number, since it is smaller than the sum of its proper divisors (2167612270).

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

2101221650 is a wasteful number, since it uses less digits than its factorization.

2101221650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4739 (or 4734 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 20.

The square root of 2101221650 is about 45839.0843058628. The cubic root of 2101221650 is about 1280.8274374120.

Adding to 2101221650 its reverse (561221012), we get a palindrome (2662442662).

The spelling of 2101221650 in words is "two billion, one hundred one million, two hundred twenty-one thousand, six hundred fifty".