21022212001 has 16 divisors (see below), whose sum is σ = 24818483200. Its totient is φ = 17425063440.

The previous prime is 21022211999. The next prime is 21022212017. The reversal of 21022212001 is 10021222012.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21022212001 - 2¹ = 21022211999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21022213001) 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, 268960 + ... + 338206.

It is an arithmetic number, because the mean of its divisors is an integer number (1551155200).

Almost surely, 2^21022212001 is an apocalyptic number.

It is an amenable number.

21022212001 is a deficient number, since it is larger than the sum of its proper divisors (3796271199).

21022212001 is a wasteful number, since it uses less digits than its factorization.

21022212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70684.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21022212001 its reverse (10021222012), we get a palindrome (31043434013).

The spelling of 21022212001 in words is "twenty-one billion, twenty-two million, two hundred twelve thousand, one".