21221355320023 has 8 divisors (see below), whose sum is σ = 22152049050240. Its totient is φ = 20306044957440.

The previous prime is 21221355320017. The next prime is 21221355320027. The reversal of 21221355320023 is 32002355312212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21221355320023 - 2¹⁷ = 21221355188951 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221355320027) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3845839090 + ... + 3845844607.

It is an arithmetic number, because the mean of its divisors is an integer number (2769006131280).

Almost surely, 2^{21221355320023} is an apocalyptic number.

21221355320023 is a deficient number, since it is larger than the sum of its proper divisors (930693730217).

21221355320023 is an equidigital number, since it uses as much as digits as its factorization.

21221355320023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7691683817.

The product of its (nonzero) digits is 21600, while the sum is 31.

The spelling of 21221355320023 in words is "twenty-one trillion, two hundred twenty-one billion, three hundred fifty-five million, three hundred twenty thousand, twenty-three".