21102202001 has 4 divisors (see below), whose sum is σ = 21102905712. Its totient is φ = 21101498292.

The previous prime is 21102201979. The next prime is 21102202007. The reversal of 21102202001 is 10020220112.

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 not a de Polignac number, because 21102202001 - 2¹⁸ = 21101939857 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21102202007) 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, 304775 + ... + 367548.

It is an arithmetic number, because the mean of its divisors is an integer number (5275726428).

Almost surely, 2^21102202001 is an apocalyptic number.

It is an amenable number.

21102202001 is a deficient number, since it is larger than the sum of its proper divisors (703711).

21102202001 is an equidigital number, since it uses as much as digits as its factorization.

21102202001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 703710.

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

Adding to 21102202001 its reverse (10020220112), we get a palindrome (31122422113).

The spelling of 21102202001 in words is "twenty-one billion, one hundred two million, two hundred two thousand, one".