22021221004 has 12 divisors (see below), whose sum is σ = 38648197224. Its totient is φ = 10978878944.

The previous prime is 22021220987. The next prime is 22021221023. The reversal of 22021221004 is 40012212022.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7931329 + ... + 7934104.

It is an arithmetic number, because the mean of its divisors is an integer number (3220683102).

Almost surely, 2^22021221004 is an apocalyptic number.

It is an amenable number.

22021221004 is a deficient number, since it is larger than the sum of its proper divisors (16626976220).

22021221004 is a wasteful number, since it uses less digits than its factorization.

22021221004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15865784 (or 15865782 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 16.

Adding to 22021221004 its reverse (40012212022), we get a palindrome (62033433026).

The spelling of 22021221004 in words is "twenty-two billion, twenty-one million, two hundred twenty-one thousand, four".