2101621156 has 12 divisors (see below), whose sum is σ = 3684443868. Its totient is φ = 1048922912.

The previous prime is 2101621147. The next prime is 2101621183. The reversal of 2101621156 is 6511261012.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 300467556 + 1801153600 = 17334^2 + 42440^2 .

It is a super-2 number, since 2×2101621156² = 8833622966693552672, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 2101621156.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 469411 + ... + 473866.

It is an arithmetic number, because the mean of its divisors is an integer number (307036989).

Almost surely, 2^2101621156 is an apocalyptic number.

It is an amenable number.

2101621156 is a deficient number, since it is larger than the sum of its proper divisors (1582822712).

2101621156 is a wasteful number, since it uses less digits than its factorization.

2101621156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 943838 (or 943836 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 2101621156 is about 45843.4417992367. The cubic root of 2101621156 is about 1280.9086069893.

Adding to 2101621156 its reverse (6511261012), we get a palindrome (8612882168).

The spelling of 2101621156 in words is "two billion, one hundred one million, six hundred twenty-one thousand, one hundred fifty-six".