21120002020001 has 8 divisors (see below), whose sum is σ = 21192675696360. Its totient is φ = 21047332369792.

The previous prime is 21120002019979. The next prime is 21120002020009. The reversal of 21120002020001 is 10002020002112.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 4624869603601 + 16495132416400 = 2150551^2 + 4061420^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21120002020001 - 2⁴² = 16721955508897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21120002020009) 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, 9698435 + ... + 11674743.

It is an arithmetic number, because the mean of its divisors is an integer number (2649084462045).

Almost surely, 2^{21120002020001} is an apocalyptic number.

It is an amenable number.

21120002020001 is a deficient number, since it is larger than the sum of its proper divisors (72673676359).

21120002020001 is a wasteful number, since it uses less digits than its factorization.

21120002020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2013075.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21120002020001 its reverse (10002020002112), we get a palindrome (31122022022113).

The spelling of 21120002020001 in words is "twenty-one trillion, one hundred twenty billion, two million, twenty thousand, one".