22100001021 has 36 divisors (see below), whose sum is σ = 37162308924. Its totient is φ = 12618950400.

The previous prime is 22100001017. The next prime is 22100001023. The reversal of 22100001021 is 12010000122.

It can be written as a sum of positive squares in 2 ways, for example, as 5371424100 + 16728576921 = 73290^2 + 129339^2 .

It is not a de Polignac number, because 22100001021 - 2² = 22100001017 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 22100000994 and 22100001012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22100001023) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 581791 + ... + 618611.

It is an arithmetic number, because the mean of its divisors is an integer number (1032286359).

Almost surely, 2^22100001021 is an apocalyptic number.

22100001021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

22100001021 is a deficient number, since it is larger than the sum of its proper divisors (15062307903).

22100001021 is a wasteful number, since it uses less digits than its factorization.

22100001021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38202 (or 38192 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 22100001021 its reverse (12010000122), we get a palindrome (34110001143).

The spelling of 22100001021 in words is "twenty-two billion, one hundred million, one thousand, twenty-one".