20211012123 has 16 divisors (see below), whose sum is σ = 27827475456. Its totient is φ = 13034596320.

The previous prime is 20211012119. The next prime is 20211012169. The reversal of 20211012123 is 32121011202.

It is not a de Polignac number, because 20211012123 - 2² = 20211012119 is a prime.

It is a super-2 number, since 2×20211012123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (20211012323) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 225540 + ... + 302142.

It is an arithmetic number, because the mean of its divisors is an integer number (1739217216).

Almost surely, 2^20211012123 is an apocalyptic number.

20211012123 is a deficient number, since it is larger than the sum of its proper divisors (7616463333).

20211012123 is a wasteful number, since it uses less digits than its factorization.

20211012123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79474.

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 20211012123 its reverse (32121011202), we get a palindrome (52332023325).

The spelling of 20211012123 in words is "twenty billion, two hundred eleven million, twelve thousand, one hundred twenty-three".