21980396122 has 4 divisors (see below), whose sum is σ = 32970594186. Its totient is φ = 10990198060.

The previous prime is 21980396117. The next prime is 21980396161. The reversal of 21980396122 is 22169308912.

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

It can be written as a sum of positive squares in only one way, i.e., 17059233321 + 4921162801 = 130611^2 + 70151^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5495099029 + ... + 5495099032.

Almost surely, 2^21980396122 is an apocalyptic number.

21980396122 is a deficient number, since it is larger than the sum of its proper divisors (10990198064).

21980396122 is a wasteful number, since it uses less digits than its factorization.

21980396122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10990198063.

The product of its (nonzero) digits is 93312, while the sum is 43.

The spelling of 21980396122 in words is "twenty-one billion, nine hundred eighty million, three hundred ninety-six thousand, one hundred twenty-two".