2120100020001 has 40 divisors (see below), whose sum is σ = 3342986160800. Its totient is φ = 1339010188056.

The previous prime is 2120100019981. The next prime is 2120100020023. The reversal of 2120100020001 is 1000200010212.

It is not a de Polignac number, because 2120100020001 - 2⁹ = 2120100019489 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (2120100020081) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1352431 + ... + 2463588.

It is an arithmetic number, because the mean of its divisors is an integer number (83574654020).

Almost surely, 2^{2120100020001} is an apocalyptic number.

It is an amenable number.

2120100020001 is a deficient number, since it is larger than the sum of its proper divisors (1222886140799).

2120100020001 is an frugal number, since it uses more digits than its factorization.

2120100020001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3816088 (or 3816041 counting only the distinct ones).

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

Adding to 2120100020001 its reverse (1000200010212), we get a palindrome (3120300030213).

The spelling of 2120100020001 in words is "two trillion, one hundred twenty billion, one hundred million, twenty thousand, one".