22101221997 has 24 divisors (see below), whose sum is σ = 32664372000. Its totient is φ = 14395498848.

The previous prime is 22101221981. The next prime is 22101221999. The reversal of 22101221997 is 79912210122.

It is a happy number.

It is not a de Polignac number, because 22101221997 - 2⁴ = 22101221981 is a prime.

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 in 23 ways as a sum of consecutive naturals, for example, 41122 + ... + 214227.

It is an arithmetic number, because the mean of its divisors is an integer number (1361015500).

Almost surely, 2^22101221997 is an apocalyptic number.

It is an amenable number.

22101221997 is a deficient number, since it is larger than the sum of its proper divisors (10563150003).

22101221997 is a wasteful number, since it uses less digits than its factorization.

22101221997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 255577 (or 255574 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The spelling of 22101221997 in words is "twenty-two billion, one hundred one million, two hundred twenty-one thousand, nine hundred ninety-seven".