21127404023 has 4 divisors (see below), whose sum is σ = 23048077128. Its totient is φ = 19206730920.

The previous prime is 21127404019. The next prime is 21127404029. The reversal of 21127404023 is 32040472112.

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 21127404023 - 2² = 21127404019 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21127403983 and 21127404001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21127404029) 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, 960336536 + ... + 960336557.

It is an arithmetic number, because the mean of its divisors is an integer number (5762019282).

Almost surely, 2^21127404023 is an apocalyptic number.

21127404023 is a deficient number, since it is larger than the sum of its proper divisors (1920673105).

21127404023 is a wasteful number, since it uses less digits than its factorization.

21127404023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1920673104.

The product of its (nonzero) digits is 2688, while the sum is 26.

Adding to 21127404023 its reverse (32040472112), we get a palindrome (53167876135).

The spelling of 21127404023 in words is "twenty-one billion, one hundred twenty-seven million, four hundred four thousand, twenty-three".