11000021123 has 24 divisors (see below), whose sum is σ = 13787831232. Its totient is φ = 8698523904.

The previous prime is 11000021111. The next prime is 11000021167. The reversal of 11000021123 is 32112000011.

It is not a de Polignac number, because 11000021123 - 2¹² = 11000017027 is a prime.

It is a super-2 number, since 2×11000021123² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (11000021023) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1555211 + ... + 1562267.

It is an arithmetic number, because the mean of its divisors is an integer number (574492968).

Almost surely, 2^11000021123 is an apocalyptic number.

11000021123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

11000021123 is a deficient number, since it is larger than the sum of its proper divisors (2787810109).

11000021123 is a wasteful number, since it uses less digits than its factorization.

11000021123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9531 (or 9524 counting only the distinct ones).

The product of its (nonzero) digits is 12, while the sum is 11.

Adding to 11000021123 its reverse (32112000011), we get a palindrome (43112021134).

The spelling of 11000021123 in words is "eleven billion, twenty-one thousand, one hundred twenty-three".