21212032201 has 4 divisors (see below), whose sum is σ = 21213444112. Its totient is φ = 21210620292.

The previous prime is 21212032157. The next prime is 21212032211. The reversal of 21212032201 is 10223021212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21212032201 - 2¹⁷ = 21211901129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21212032211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 683175 + ... + 713548.

It is an arithmetic number, because the mean of its divisors is an integer number (5303361028).

Almost surely, 2^21212032201 is an apocalyptic number.

It is an amenable number.

21212032201 is a deficient number, since it is larger than the sum of its proper divisors (1411911).

21212032201 is a wasteful number, since it uses less digits than its factorization.

21212032201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1411910.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21212032201 its reverse (10223021212), we get a palindrome (31435053413).

The spelling of 21212032201 in words is "twenty-one billion, two hundred twelve million, thirty-two thousand, two hundred one".