20212321210209 has 8 divisors (see below), whose sum is σ = 29944179570720. Its totient is φ = 13474880806788.

The previous prime is 20212321210201. The next prime is 20212321210217. The reversal of 20212321210209 is 90201212321202.

20212321210209 is a `hidden beast` number, since 2 + 0 + 212 + 32 + 1 + 210 + 209 = 666.

It is an interprime number because it is at equal distance from previous prime (20212321210201) and next prime (20212321210217).

It is not a de Polignac number, because 20212321210209 - 2³ = 20212321210201 is a prime.

It is a super-2 number, since 2×20212321210209² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 748604489267 = 20212321210209 / (2 + 0 + 2 + 1 + 2 + 3 + 2 + 1 + 2 + 1 + 0 + 2 + 0 + 9).

It is not an unprimeable number, because it can be changed into a prime (20212321210201) 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, 374302244607 + ... + 374302244660.

It is an arithmetic number, because the mean of its divisors is an integer number (3743022446340).

Almost surely, 2^{20212321210209} is an apocalyptic number.

It is an amenable number.

20212321210209 is a deficient number, since it is larger than the sum of its proper divisors (9731858360511).

20212321210209 is an equidigital number, since it uses as much as digits as its factorization.

20212321210209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 748604489276 (or 748604489270 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The spelling of 20212321210209 in words is "twenty trillion, two hundred twelve billion, three hundred twenty-one million, two hundred ten thousand, two hundred nine".