20000021123 has 8 divisors (see below), whose sum is σ = 20029311168. Its totient is φ = 19970754984.

The previous prime is 20000021051. The next prime is 20000021137. The reversal of 20000021123 is 32112000002.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20000021123 - 2¹⁰ = 20000020099 is a prime.

It is a super-2 number, since 2×20000021123² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20000021143) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2236940 + ... + 2245862.

It is an arithmetic number, because the mean of its divisors is an integer number (2503663896).

Almost surely, 2^20000021123 is an apocalyptic number.

20000021123 is a deficient number, since it is larger than the sum of its proper divisors (29290045).

20000021123 is a wasteful number, since it uses less digits than its factorization.

20000021123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11953.

The product of its (nonzero) digits is 24, while the sum is 11.

Adding to 20000021123 its reverse (32112000002), we get a palindrome (52112021125).

The spelling of 20000021123 in words is "twenty billion, twenty-one thousand, one hundred twenty-three".