21000002022001 has 4 divisors (see below), whose sum is σ = 21000026531952. Its totient is φ = 20999977512052.

The previous prime is 21000002021983. The next prime is 21000002022007. The reversal of 21000002022001 is 10022020000012.

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 21000002022001 - 2²³ = 20999993633393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21000002022007) 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, 10921411 + ... + 12699496.

It is an arithmetic number, because the mean of its divisors is an integer number (5250006632988).

Almost surely, 2^{21000002022001} is an apocalyptic number.

It is an amenable number.

21000002022001 is a deficient number, since it is larger than the sum of its proper divisors (24509951).

21000002022001 is an equidigital number, since it uses as much as digits as its factorization.

21000002022001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24509950.

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 21000002022001 its reverse (10022020000012), we get a palindrome (31022022022013).

The spelling of 21000002022001 in words is "twenty-one trillion, two million, twenty-two thousand, one".