21210222212201 has 4 divisors (see below), whose sum is σ = 23138424231504. Its totient is φ = 19282020192900.

The previous prime is 21210222212173. The next prime is 21210222212219. The reversal of 21210222212201 is 10221222201212.

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 21210222212201 - 2¹⁴ = 21210222195817 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21210222212401) 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, 964101009635 + ... + 964101009656.

It is an arithmetic number, because the mean of its divisors is an integer number (5784606057876).

Almost surely, 2^{21210222212201} is an apocalyptic number.

It is an amenable number.

21210222212201 is a deficient number, since it is larger than the sum of its proper divisors (1928202019303).

21210222212201 is a wasteful number, since it uses less digits than its factorization.

21210222212201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1928202019302.

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 21210222212201 its reverse (10221222201212), we get a palindrome (31431444413413).

The spelling of 21210222212201 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty-two million, two hundred twelve thousand, two hundred one".