21210652101 has 4 divisors (see below), whose sum is σ = 28280869472. Its totient is φ = 14140434732.

The previous prime is 21210652091. The next prime is 21210652103. The reversal of 21210652101 is 10125601212.

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 not a de Polignac number, because 21210652101 - 2¹¹ = 21210650053 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 (21210652103) 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, 3535108681 + ... + 3535108686.

It is an arithmetic number, because the mean of its divisors is an integer number (7070217368).

Almost surely, 2^21210652101 is an apocalyptic number.

It is an amenable number.

21210652101 is a deficient number, since it is larger than the sum of its proper divisors (7070217371).

21210652101 is an equidigital number, since it uses as much as digits as its factorization.

21210652101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7070217370.

The product of its (nonzero) digits is 240, while the sum is 21.

The spelling of 21210652101 in words is "twenty-one billion, two hundred ten million, six hundred fifty-two thousand, one hundred one".