20101220002123 has 4 divisors (see below), whose sum is σ = 21647467694608. Its totient is φ = 18554972309640.

The previous prime is 20101220002099. The next prime is 20101220002141. The reversal of 20101220002123 is 32120002210102.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a de Polignac number, because none of the positive numbers 2^k-20101220002123 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20101220002097 and 20101220002106.

It is not an unprimeable number, because it can be changed into a prime (20101220012123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 773123846223 + ... + 773123846248.

It is an arithmetic number, because the mean of its divisors is an integer number (5411866923652).

Almost surely, 2^{20101220002123} is an apocalyptic number.

20101220002123 is a deficient number, since it is larger than the sum of its proper divisors (1546247692485).

20101220002123 is a wasteful number, since it uses less digits than its factorization.

20101220002123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1546247692484.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 20101220002123 its reverse (32120002210102), we get a palindrome (52221222212225).

The spelling of 20101220002123 in words is "twenty trillion, one hundred one billion, two hundred twenty million, two thousand, one hundred twenty-three".