21012222122001 has 48 divisors (see below), whose sum is σ = 34367147438400. Its totient is φ = 12678579714240.

The previous prime is 21012222121999. The next prime is 21012222122011. The reversal of 21012222122001 is 10022122221012.

It is a happy number.

21012222122001 is a `hidden beast` number, since 210 + 1 + 222 + 212 + 20 + 0 + 1 = 666.

It is not a de Polignac number, because 21012222122001 - 2¹ = 21012222121999 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21012222122011) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13425036 + ... + 14908253.

It is an arithmetic number, because the mean of its divisors is an integer number (715982238300).

Almost surely, 2^{21012222122001} is an apocalyptic number.

It is an amenable number.

21012222122001 is a deficient number, since it is larger than the sum of its proper divisors (13354925316399).

21012222122001 is a wasteful number, since it uses less digits than its factorization.

21012222122001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28333547 (or 28333530 counting only the distinct ones).

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

Adding to 21012222122001 its reverse (10022122221012), we get a palindrome (31034344343013).

The spelling of 21012222122001 in words is "twenty-one trillion, twelve billion, two hundred twenty-two million, one hundred twenty-two thousand, one".