21102012201 has 32 divisors (see below), whose sum is σ = 29689970688. Its totient is φ = 13311789120.

The previous prime is 21102012187. The next prime is 21102012203. The reversal of 21102012201 is 10221020112.

It is not a de Polignac number, because 21102012201 - 2⁶ = 21102012137 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21102012203) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6978976 + ... + 6981998.

It is an arithmetic number, because the mean of its divisors is an integer number (927811584).

Almost surely, 2^21102012201 is an apocalyptic number.

It is an amenable number.

21102012201 is a deficient number, since it is larger than the sum of its proper divisors (8587958487).

21102012201 is a wasteful number, since it uses less digits than its factorization.

21102012201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4701.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21102012201 its reverse (10221020112), we get a palindrome (31323032313).

The spelling of 21102012201 in words is "twenty-one billion, one hundred two million, twelve thousand, two hundred one".