21154662042023 has 4 divisors (see below), whose sum is σ = 21157318669608. Its totient is φ = 21152005414440.

The previous prime is 21154662041993. The next prime is 21154662042029. The reversal of 21154662042023 is 32024026645112.

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 21154662042023 - 2¹⁰ = 21154662040999 is a prime.

It is a super-2 number, since 2×21154662042023² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154662042029) 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, 1328301848 + ... + 1328317773.

It is an arithmetic number, because the mean of its divisors is an integer number (5289329667402).

Almost surely, 2^{21154662042023} is an apocalyptic number.

21154662042023 is a deficient number, since it is larger than the sum of its proper divisors (2656627585).

21154662042023 is an equidigital number, since it uses as much as digits as its factorization.

21154662042023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2656627584.

The product of its (nonzero) digits is 138240, while the sum is 38.

Adding to 21154662042023 its reverse (32024026645112), we get a palindrome (53178688687135).

The spelling of 21154662042023 in words is "twenty-one trillion, one hundred fifty-four billion, six hundred sixty-two million, forty-two thousand, twenty-three".