22001010021 has 8 divisors (see below), whose sum is σ = 32594088960. Its totient is φ = 14667339996.

The previous prime is 22001010011. The next prime is 22001010049. The reversal of 22001010021 is 12001010022.

It is not a de Polignac number, because 22001010021 - 2⁶ = 22001009957 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 = 22001009985 and 22001010012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001010011) by changing a digit.

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, 407426085 + ... + 407426138.

It is an arithmetic number, because the mean of its divisors is an integer number (4074261120).

Almost surely, 2^22001010021 is an apocalyptic number.

It is an amenable number.

22001010021 is a deficient number, since it is larger than the sum of its proper divisors (10593078939).

22001010021 is an equidigital number, since it uses as much as digits as its factorization.

22001010021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 814852232 (or 814852226 counting only the distinct ones).

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

Adding to 22001010021 its reverse (12001010022), we get a palindrome (34002020043).

Subtracting from 22001010021 its reverse (12001010022), we obtain a palindrome (9999999999).

The spelling of 22001010021 in words is "twenty-two billion, one million, ten thousand, twenty-one".