21021122122001 has 8 divisors (see below), whose sum is σ = 21746167322880. Its totient is φ = 20296088849232.

The previous prime is 21021122121917. The next prime is 21021122122043. The reversal of 21021122122001 is 10022122112012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21021122122001 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21021122122061) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 679616 + ... + 6519518.

It is an arithmetic number, because the mean of its divisors is an integer number (2718270915360).

Almost surely, 2^{21021122122001} is an apocalyptic number.

It is an amenable number.

21021122122001 is a deficient number, since it is larger than the sum of its proper divisors (725045200879).

21021122122001 is a wasteful number, since it uses less digits than its factorization.

21021122122001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5964055.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21021122122001 its reverse (10022122112012), we get a palindrome (31043244234013).

The spelling of 21021122122001 in words is "twenty-one trillion, twenty-one billion, one hundred twenty-two million, one hundred twenty-two thousand, one".