21992101101 has 20 divisors (see below), whose sum is σ = 33033924924. Its totient is φ = 14580388800.

The previous prime is 21992101099. The next prime is 21992101121. The reversal of 21992101101 is 10110129912.

It can be written as a sum of positive squares in 2 ways, for example, as 169130025 + 21822971076 = 13005^2 + 147726^2 .

It is not a de Polignac number, because 21992101101 - 2¹ = 21992101099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21992101121) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 735360 + ... + 764681.

Almost surely, 2^21992101101 is an apocalyptic number.

It is an amenable number.

21992101101 is a deficient number, since it is larger than the sum of its proper divisors (11041823823).

21992101101 is a wasteful number, since it uses less digits than its factorization.

21992101101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1500234 (or 1500225 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 27.

The spelling of 21992101101 in words is "twenty-one billion, nine hundred ninety-two million, one hundred one thousand, one hundred one".