21020122021209 has 8 divisors (see below), whose sum is σ = 28026862124352. Its totient is φ = 14013398299440.

The previous prime is 21020122021081. The next prime is 21020122021231. The reversal of 21020122021209 is 90212022102012.

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

It is not a de Polignac number, because 21020122021209 - 2⁷ = 21020122021081 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21020122021009) 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, 698862 + ... + 6521399.

It is an arithmetic number, because the mean of its divisors is an integer number (3503357765544).

Almost surely, 2^{21020122021209} is an apocalyptic number.

It is an amenable number.

21020122021209 is a deficient number, since it is larger than the sum of its proper divisors (7006740103143).

21020122021209 is an equidigital number, since it uses as much as digits as its factorization.

21020122021209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8190687.

The product of its (nonzero) digits is 576, while the sum is 24.

The spelling of 21020122021209 in words is "twenty-one trillion, twenty billion, one hundred twenty-two million, twenty-one thousand, two hundred nine".