21222020001 has 24 divisors (see below), whose sum is σ = 35447772864. Its totient is φ = 11194031520.

The previous prime is 21222019993. The next prime is 21222020003. The reversal of 21222020001 is 10002022212.

It is not a de Polignac number, because 21222020001 - 2³ = 21222019993 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21222020003) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5550685 + ... + 5554506.

It is an arithmetic number, because the mean of its divisors is an integer number (1476990536).

Almost surely, 2^21222020001 is an apocalyptic number.

21222020001 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21222020001 is a deficient number, since it is larger than the sum of its proper divisors (14225752863).

21222020001 is a wasteful number, since it uses less digits than its factorization.

21222020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11105221 (or 11105214 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21222020001 its reverse (10002022212), we get a palindrome (31224042213).

It can be divided in two parts, 212220 and 20001, that added together give a triangular number (232221 = T₆₈₁).

The spelling of 21222020001 in words is "twenty-one billion, two hundred twenty-two million, twenty thousand, one".