21210021222201 has 64 divisors (see below), whose sum is σ = 36139286937600. Its totient is φ = 12043067594688.

The previous prime is 21210021222119. The next prime is 21210021222209. The reversal of 21210021222201 is 10222212001212.

It is a happy number.

21210021222201 is a `hidden beast` number, since 21 + 210 + 0 + 212 + 2 + 220 + 1 = 666.

It is not a de Polignac number, because 21210021222201 - 2⁷ = 21210021222073 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21210021222209) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 87908736 + ... + 88149678.

It is an arithmetic number, because the mean of its divisors is an integer number (564676358400).

Almost surely, 2^{21210021222201} is an apocalyptic number.

21210021222201 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21210021222201 is a deficient number, since it is larger than the sum of its proper divisors (14929265715399).

21210021222201 is a wasteful number, since it uses less digits than its factorization.

21210021222201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 243915 (or 243909 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

Adding to 21210021222201 its reverse (10222212001212), we get a palindrome (31432233223413).

The spelling of 21210021222201 in words is "twenty-one trillion, two hundred ten billion, twenty-one million, two hundred twenty-two thousand, two hundred one".