21201022220101 has 4 divisors (see below), whose sum is σ = 22122805794912. Its totient is φ = 20279238645292.

The previous prime is 21201022220029. The next prime is 21201022220137. The reversal of 21201022220101 is 10102222010212.

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 21201022220101 - 2⁹ = 21201022219589 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 (21201022224101) 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, 460891787371 + ... + 460891787416.

It is an arithmetic number, because the mean of its divisors is an integer number (5530701448728).

Almost surely, 2^{21201022220101} is an apocalyptic number.

It is an amenable number.

21201022220101 is a deficient number, since it is larger than the sum of its proper divisors (921783574811).

21201022220101 is an equidigital number, since it uses as much as digits as its factorization.

21201022220101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 921783574810.

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

Adding to 21201022220101 its reverse (10102222010212), we get a palindrome (31303244230313).

The spelling of 21201022220101 in words is "twenty-one trillion, two hundred one billion, twenty-two million, two hundred twenty thousand, one hundred one".