21012222002001 has 32 divisors (see below), whose sum is σ = 28766107238400. Its totient is φ = 13634860667520.

The previous prime is 21012222001993. The next prime is 21012222002011. The reversal of 21012222002001 is 10020022221012.

It is not a de Polignac number, because 21012222002001 - 2³ = 21012222001993 is a prime.

It is a super-2 number, since 2×21012222002001² (a number of 27 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21012222002011) 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, 96021730 + ... + 96240308.

It is an arithmetic number, because the mean of its divisors is an integer number (898940851200).

Almost surely, 2^{21012222002001} is an apocalyptic number.

It is an amenable number.

21012222002001 is a deficient number, since it is larger than the sum of its proper divisors (7753885236399).

21012222002001 is a wasteful number, since it uses less digits than its factorization.

21012222002001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220429.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21012222002001 its reverse (10020022221012), we get a palindrome (31032244223013).

The spelling of 21012222002001 in words is "twenty-one trillion, twelve billion, two hundred twenty-two million, two thousand, one".