21121101002 has 16 divisors (see below), whose sum is σ = 33550501320. Its totient is φ = 9937794048.

The previous prime is 21121100963. The next prime is 21121101059. The reversal of 21121101002 is 20010112112.

It can be written as a sum of positive squares in 4 ways, for example, as 20955747121 + 165353881 = 144761^2 + 12859^2 .

It is a super-2 number, since 2×21121101002² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190274 + ... + 280082.

Almost surely, 2^21121101002 is an apocalyptic number.

21121101002 is a deficient number, since it is larger than the sum of its proper divisors (12429400318).

21121101002 is a wasteful number, since it uses less digits than its factorization.

21121101002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96745.

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 21121101002 its reverse (20010112112), we get a palindrome (41131213114).

It can be divided in two parts, 2112110 and 1002, that added together give a palindrome (2113112).

The spelling of 21121101002 in words is "twenty-one billion, one hundred twenty-one million, one hundred one thousand, two".