21222010001209 has 16 divisors (see below), whose sum is σ = 21364249737600. Its totient is φ = 21080319848064.

The previous prime is 21222010001147. The next prime is 21222010001281. The reversal of 21222010001209 is 90210001022212.

It is a cyclic number.

It is not a de Polignac number, because 21222010001209 - 2²⁵ = 21221976446777 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21222010001209.

It is not an unprimeable number, because it can be changed into a prime (21222010001609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153028869 + ... + 153167485.

It is an arithmetic number, because the mean of its divisors is an integer number (1335265608600).

Almost surely, 2^{21222010001209} is an apocalyptic number.

It is an amenable number.

21222010001209 is a deficient number, since it is larger than the sum of its proper divisors (142239736391).

21222010001209 is a wasteful number, since it uses less digits than its factorization.

21222010001209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140592.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 21222010001209 in words is "twenty-one trillion, two hundred twenty-two billion, ten million, one thousand, two hundred nine".