21122101103221 has 4 divisors (see below), whose sum is σ = 21123221123200. Its totient is φ = 21120981083244.

The previous prime is 21122101103203. The next prime is 21122101103227. The reversal of 21122101103221 is 12230110122112.

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 21122101103221 - 2¹⁵ = 21122101070453 is a prime.

It is a super-2 number, since 2×21122101103221² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122101103227) 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, 559981701 + ... + 560019418.

It is an arithmetic number, because the mean of its divisors is an integer number (5280805280800).

Almost surely, 2^{21122101103221} is an apocalyptic number.

It is an amenable number.

21122101103221 is a deficient number, since it is larger than the sum of its proper divisors (1120019979).

21122101103221 is a wasteful number, since it uses less digits than its factorization.

21122101103221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1120019978.

The product of its (nonzero) digits is 96, while the sum is 19.

Adding to 21122101103221 its reverse (12230110122112), we get a palindrome (33352211225333).

The spelling of 21122101103221 in words is "twenty-one trillion, one hundred twenty-two billion, one hundred one million, one hundred three thousand, two hundred twenty-one".