22001211021 has 8 divisors (see below), whose sum is σ = 30346498080. Its totient is φ = 14161698992.

The previous prime is 22001211019. The next prime is 22001211047. The reversal of 22001211021 is 12011210022.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 22001211021 - 2¹ = 22001211019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22001210988 and 22001211006.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22001216021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 126443655 + ... + 126443828.

It is an arithmetic number, because the mean of its divisors is an integer number (3793312260).

Almost surely, 2^22001211021 is an apocalyptic number.

It is an amenable number.

22001211021 is a deficient number, since it is larger than the sum of its proper divisors (8345287059).

22001211021 is a wasteful number, since it uses less digits than its factorization.

22001211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 252887515.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 22001211021 its reverse (12011210022), we get a palindrome (34012421043).

Subtracting from 22001211021 its reverse (12011210022), we obtain a palindrome (9990000999).

The spelling of 22001211021 in words is "twenty-two billion, one million, two hundred eleven thousand, twenty-one".