10221901997 has 4 divisors (see below), whose sum is σ = 10222633920. Its totient is φ = 10221170076.

The previous prime is 10221901973. The next prime is 10221902023. The reversal of 10221901997 is 79910912201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 10221901997 - 2¹² = 10221897901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (10221901927) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 344597 + ... + 373082.

It is an arithmetic number, because the mean of its divisors is an integer number (2555658480).

Almost surely, 2^10221901997 is an apocalyptic number.

It is an amenable number.

10221901997 is a deficient number, since it is larger than the sum of its proper divisors (731923).

10221901997 is an equidigital number, since it uses as much as digits as its factorization.

10221901997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 731922.

The product of its (nonzero) digits is 20412, while the sum is 41.

The spelling of 10221901997 in words is "ten billion, two hundred twenty-one million, nine hundred one thousand, nine hundred ninety-seven".