21021122104 has 8 divisors (see below), whose sum is σ = 39414603960. Its totient is φ = 10510561048.

The previous prime is 21021122071. The next prime is 21021122137. The reversal of 21021122104 is 40122112012.

It is an interprime number because it is at equal distance from previous prime (21021122071) and next prime (21021122137).

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×21021122104² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

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 as a sum of consecutive naturals, namely, 1313820124 + ... + 1313820139.

It is an arithmetic number, because the mean of its divisors is an integer number (4926825495).

Almost surely, 2^21021122104 is an apocalyptic number.

It is an amenable number.

21021122104 is a deficient number, since it is larger than the sum of its proper divisors (18393481856).

21021122104 is a wasteful number, since it uses less digits than its factorization.

21021122104 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2627640269 (or 2627640265 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21021122104 its reverse (40122112012), we get a palindrome (61143234116).

The spelling of 21021122104 in words is "twenty-one billion, twenty-one million, one hundred twenty-two thousand, one hundred four".