21210202022101 has 4 divisors (see below), whose sum is σ = 21210318895392. Its totient is φ = 21210085148812.

The previous prime is 21210202022081. The next prime is 21210202022129. The reversal of 21210202022101 is 10122020201212.

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-21210202022101 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 (21210202022201) 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, 58164001 + ... + 58527526.

It is an arithmetic number, because the mean of its divisors is an integer number (5302579723848).

Almost surely, 2^{21210202022101} is an apocalyptic number.

It is an amenable number.

21210202022101 is a deficient number, since it is larger than the sum of its proper divisors (116873291).

21210202022101 is a wasteful number, since it uses less digits than its factorization.

21210202022101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116873290.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21210202022101 its reverse (10122020201212), we get a palindrome (31332222223313).

The spelling of 21210202022101 in words is "twenty-one trillion, two hundred ten billion, two hundred two million, twenty-two thousand, one hundred one".