20011001212123 has 16 divisors (see below), whose sum is σ = 20675939639040. Its totient is φ = 19347279811200.

The previous prime is 20011001212031. The next prime is 20011001212199. The reversal of 20011001212123 is 32121210011002.

It is a cyclic number.

It is not a de Polignac number, because 20011001212123 - 2³⁷ = 19873562258651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011001212097 and 20011001212106.

It is not an unprimeable number, because it can be changed into a prime (20011001216123) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 558995461 + ... + 559031257.

It is an arithmetic number, because the mean of its divisors is an integer number (1292246227440).

Almost surely, 2^{20011001212123} is an apocalyptic number.

20011001212123 is a deficient number, since it is larger than the sum of its proper divisors (664938426917).

20011001212123 is a wasteful number, since it uses less digits than its factorization.

20011001212123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52278.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 20011001212123 its reverse (32121210011002), we get a palindrome (52132211223125).

The spelling of 20011001212123 in words is "twenty trillion, eleven billion, one million, two hundred twelve thousand, one hundred twenty-three".