21121100033123 has 4 divisors (see below), whose sum is σ = 21121155328968. Its totient is φ = 21121044737280.

The previous prime is 21121100032999. The next prime is 21121100033141. The reversal of 21121100033123 is 32133000112112.

It is a happy number.

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 21121100033123 - 2⁸ = 21121100032867 is a prime.

It is a super-2 number, since 2×21121100033123² (a number of 27 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 = 21121100033095 and 21121100033104.

It is not an unprimeable number, because it can be changed into a prime (21121100030123) 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, 27070961 + ... + 27840242.

It is an arithmetic number, because the mean of its divisors is an integer number (5280288832242).

Almost surely, 2^{21121100033123} is an apocalyptic number.

21121100033123 is a deficient number, since it is larger than the sum of its proper divisors (55295845).

21121100033123 is an equidigital number, since it uses as much as digits as its factorization.

21121100033123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55295844.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 21121100033123 its reverse (32133000112112), we get a palindrome (53254100145235).

The spelling of 21121100033123 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred million, thirty-three thousand, one hundred twenty-three".