20011210123 has 2 divisors, whose sum is σ = 20011210124. Its totient is φ = 20011210122.

The previous prime is 20011210091. The next prime is 20011210133. The reversal of 20011210123 is 32101211002.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20011210123 - 2⁵ = 20011210091 is a prime.

It is not a weakly prime, because it can be changed into another prime (20011210133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10005605061 + 10005605062.

It is an arithmetic number, because the mean of its divisors is an integer number (10005605062).

Almost surely, 2^20011210123 is an apocalyptic number.

20011210123 is a deficient number, since it is larger than the sum of its proper divisors (1).

20011210123 is an equidigital number, since it uses as much as digits as its factorization.

20011210123 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 20011210123 its reverse (32101211002), we get a palindrome (52112421125).

The spelling of 20011210123 in words is "twenty billion, eleven million, two hundred ten thousand, one hundred twenty-three".