21001110102001 has 8 divisors (see below), whose sum is σ = 21149708959808. Its totient is φ = 20852636490000.

The previous prime is 21001110101957. The next prime is 21001110102019. The reversal of 21001110102001 is 10020101110012.

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-21001110102001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21001110102031) 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, 30974895 + ... + 31645636.

It is an arithmetic number, because the mean of its divisors is an integer number (2643713619976).

Almost surely, 2^{21001110102001} is an apocalyptic number.

It is an amenable number.

21001110102001 is a deficient number, since it is larger than the sum of its proper divisors (148598857807).

21001110102001 is a wasteful number, since it uses less digits than its factorization.

21001110102001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62622903.

The product of its (nonzero) digits is 4, while the sum is 10.

Adding to 21001110102001 its reverse (10020101110012), we get a palindrome (31021211212013).

The spelling of 21001110102001 in words is "twenty-one trillion, one billion, one hundred ten million, one hundred two thousand, one".