21201002221001 has 8 divisors (see below), whose sum is σ = 21271923569280. Its totient is φ = 21130101169632.

The previous prime is 21201002220967. The next prime is 21201002221031. The reversal of 21201002221001 is 10012220010212.

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

It is a cyclic number.

It is not a de Polignac number, because 21201002221001 - 2²² = 21200998026697 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21201002221031) 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, 2980205 + ... + 7161258.

It is an arithmetic number, because the mean of its divisors is an integer number (2658990446160).

Almost surely, 2^{21201002221001} is an apocalyptic number.

It is an amenable number.

21201002221001 is a deficient number, since it is larger than the sum of its proper divisors (70921348279).

21201002221001 is a wasteful number, since it uses less digits than its factorization.

21201002221001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10148455.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21201002221001 its reverse (10012220010212), we get a palindrome (31213222231213).

The spelling of 21201002221001 in words is "twenty-one trillion, two hundred one billion, two million, two hundred twenty-one thousand, one".