211020123 has 4 divisors (see below), whose sum is σ = 281360168. Its totient is φ = 140680080.

The previous prime is 211020119. The next prime is 211020127. The reversal of 211020123 is 321020112.

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

It is an interprime number because it is at equal distance from previous prime (211020119) and next prime (211020127).

It is not a de Polignac number, because 211020123 - 2² = 211020119 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211020099 and 211020108.

It is not an unprimeable number, because it can be changed into a prime (211020127) 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, 35170018 + ... + 35170023.

It is an arithmetic number, because the mean of its divisors is an integer number (70340042).

Almost surely, 2^211020123 is an apocalyptic number.

211020123 is a deficient number, since it is larger than the sum of its proper divisors (70340045).

211020123 is an equidigital number, since it uses as much as digits as its factorization.

211020123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70340044.

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 211020123 is about 14526.5316920454. The cubic root of 211020123 is about 595.3531063201.

Adding to 211020123 its reverse (321020112), we get a palindrome (532040235).

The spelling of 211020123 in words is "two hundred eleven million, twenty thousand, one hundred twenty-three".