21022002001 has 96 divisors (see below), whose sum is σ = 31746048768. Its totient is φ = 13610741760.

The previous prime is 21022001977. The next prime is 21022002011. The reversal of 21022002001 is 10020022012.

It is not a de Polignac number, because 21022002001 - 2²³ = 21013613393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022002011) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2735901 + ... + 2743573.

It is an arithmetic number, because the mean of its divisors is an integer number (330688008).

Almost surely, 2^21022002001 is an apocalyptic number.

It is an amenable number.

21022002001 is a deficient number, since it is larger than the sum of its proper divisors (10724046767).

21022002001 is a wasteful number, since it uses less digits than its factorization.

21022002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7751 (or 7744 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21022002001 its reverse (10020022012), we get a palindrome (31042024013).

The spelling of 21022002001 in words is "twenty-one billion, twenty-two million, two thousand, one".