21100022201 has 4 divisors (see below), whose sum is σ = 21217899600. Its totient is φ = 20982144804.

The previous prime is 21100022173. The next prime is 21100022263. The reversal of 21100022201 is 10222000112.

It is a happy number.

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 a de Polignac number, because none of the positive numbers 2^k-21100022201 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21100022401) 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, 58938431 + ... + 58938788.

It is an arithmetic number, because the mean of its divisors is an integer number (5304474900).

Almost surely, 2^21100022201 is an apocalyptic number.

It is an amenable number.

21100022201 is a deficient number, since it is larger than the sum of its proper divisors (117877399).

21100022201 is a wasteful number, since it uses less digits than its factorization.

21100022201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 117877398.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21100022201 its reverse (10222000112), we get a palindrome (31322022313).

The spelling of 21100022201 in words is "twenty-one billion, one hundred million, twenty-two thousand, two hundred one".