21220101323 has 4 divisors (see below), whose sum is σ = 22142714448. Its totient is φ = 20297488200.

The previous prime is 21220101271. The next prime is 21220101367. The reversal of 21220101323 is 32310102212.

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 21220101323 - 2¹⁰ = 21220100299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21220101823) 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, 461306528 + ... + 461306573.

It is an arithmetic number, because the mean of its divisors is an integer number (5535678612).

Almost surely, 2^21220101323 is an apocalyptic number.

21220101323 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

21220101323 is a deficient number, since it is larger than the sum of its proper divisors (922613125).

21220101323 is an equidigital number, since it uses as much as digits as its factorization.

21220101323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 922613124.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21220101323 its reverse (32310102212), we get a palindrome (53530203535).

The spelling of 21220101323 in words is "twenty-one billion, two hundred twenty million, one hundred one thousand, three hundred twenty-three".