21122021210999 has 4 divisors (see below), whose sum is σ = 21571425917664. Its totient is φ = 20672616504336.

The previous prime is 21122021210959. The next prime is 21122021211037. The reversal of 21122021210999 is 99901212022112.

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 21122021210999 - 2³⁶ = 21053301734263 is a prime.

It is a super-2 number, since 2×21122021210999² (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 (21122021210909) 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, 224702353262 + ... + 224702353355.

It is an arithmetic number, because the mean of its divisors is an integer number (5392856479416).

Almost surely, 2^{21122021210999} is an apocalyptic number.

21122021210999 is a deficient number, since it is larger than the sum of its proper divisors (449404706665).

21122021210999 is an equidigital number, since it uses as much as digits as its factorization.

21122021210999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449404706664.

The product of its (nonzero) digits is 23328, while the sum is 41.

The spelling of 21122021210999 in words is "twenty-one trillion, one hundred twenty-two billion, twenty-one million, two hundred ten thousand, nine hundred ninety-nine".