21221122101 has 4 divisors (see below), whose sum is σ = 28294829472. Its totient is φ = 14147414732.

The previous prime is 21221122093. The next prime is 21221122147. The reversal of 21221122101 is 10122112212.

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 21221122101 - 2³ = 21221122093 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221192101) 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, 3536853681 + ... + 3536853686.

It is an arithmetic number, because the mean of its divisors is an integer number (7073707368).

Almost surely, 2^21221122101 is an apocalyptic number.

It is an amenable number.

21221122101 is a deficient number, since it is larger than the sum of its proper divisors (7073707371).

21221122101 is an equidigital number, since it uses as much as digits as its factorization.

21221122101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7073707370.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21221122101 its reverse (10122112212), we get a palindrome (31343234313).

The spelling of 21221122101 in words is "twenty-one billion, two hundred twenty-one million, one hundred twenty-two thousand, one hundred one".