21222100101023 has 4 divisors (see below), whose sum is σ = 21240538069248. Its totient is φ = 21203662132800.

The previous prime is 21222100101019. The next prime is 21222100101029. The reversal of 21222100101023 is 32010100122212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21222100101023 - 2² = 21222100101019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21222100100992 and 21222100101010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21222100101029) 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, 9218982386 + ... + 9218984687.

It is an arithmetic number, because the mean of its divisors is an integer number (5310134517312).

Almost surely, 2^{21222100101023} is an apocalyptic number.

21222100101023 is a deficient number, since it is larger than the sum of its proper divisors (18437968225).

21222100101023 is a wasteful number, since it uses less digits than its factorization.

21222100101023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18437968224.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21222100101023 its reverse (32010100122212), we get a palindrome (53232200223235).

The spelling of 21222100101023 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred million, one hundred one thousand, twenty-three".