21000010022001 has 16 divisors (see below), whose sum is σ = 31575471124800. Its totient is φ = 13791051356544.

The previous prime is 21000010021987. The next prime is 21000010022029. The reversal of 21000010022001 is 10022001000012.

It is not a de Polignac number, because 21000010022001 - 2¹⁴ = 21000010005617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (21000010022051) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5804312736 + ... + 5804316353.

It is an arithmetic number, because the mean of its divisors is an integer number (1973466945300).

Almost surely, 2^{21000010022001} is an apocalyptic number.

It is an amenable number.

21000010022001 is a deficient number, since it is larger than the sum of its proper divisors (10575461102799).

21000010022001 is a wasteful number, since it uses less digits than its factorization.

21000010022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11608629165 (or 11608629159 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 21000010022001 its reverse (10022001000012), we get a palindrome (31022011022013).

The spelling of 21000010022001 in words is "twenty-one trillion, ten million, twenty-two thousand, one".