211020101123 has 4 divisors (see below), whose sum is σ = 227252416608. Its totient is φ = 194787785640.

The previous prime is 211020101111. The next prime is 211020101153. The reversal of 211020101123 is 321101020112.

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

It is a cyclic number.

It is not a de Polignac number, because 211020101123 - 2⁴ = 211020101107 is a prime.

It is a super-2 number, since 2×211020101123² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211020101098 and 211020101107.

It is not an unprimeable number, because it can be changed into a prime (211020101153) 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, 8116157723 + ... + 8116157748.

It is an arithmetic number, because the mean of its divisors is an integer number (56813104152).

Almost surely, 2^211020101123 is an apocalyptic number.

211020101123 is a deficient number, since it is larger than the sum of its proper divisors (16232315485).

211020101123 is a wasteful number, since it uses less digits than its factorization.

211020101123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16232315484.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 211020101123 its reverse (321101020112), we get a palindrome (532121121235).

The spelling of 211020101123 in words is "two hundred eleven billion, twenty million, one hundred one thousand, one hundred twenty-three".