22101221998 has 4 divisors (see below), whose sum is σ = 33151833000. Its totient is φ = 11050610998.

The previous prime is 22101221981. The next prime is 22101221999. The reversal of 22101221998 is 89912210122.

It is a semiprime because it is the product of two primes.

It is a super-2 number, since 2×22101221998² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22101221999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5525305498 + ... + 5525305501.

It is an arithmetic number, because the mean of its divisors is an integer number (8287958250).

Almost surely, 2^22101221998 is an apocalyptic number.

22101221998 is a deficient number, since it is larger than the sum of its proper divisors (11050611002).

22101221998 is a wasteful number, since it uses less digits than its factorization.

22101221998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11050611001.

The product of its (nonzero) digits is 10368, while the sum is 37.

The spelling of 22101221998 in words is "twenty-two billion, one hundred one million, two hundred twenty-one thousand, nine hundred ninety-eight".