21154254023 has 8 divisors (see below), whose sum is σ = 24249333120. Its totient is φ = 18077435640.

The previous prime is 21154254019. The next prime is 21154254041. The reversal of 21154254023 is 32045245112.

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 21154254023 - 2² = 21154254019 is a prime.

It is a super-2 number, since 2×21154254023² (a number of 21 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 (21154254323) 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, 4562693 + ... + 4567326.

It is an arithmetic number, because the mean of its divisors is an integer number (3031166640).

Almost surely, 2^21154254023 is an apocalyptic number.

21154254023 is a deficient number, since it is larger than the sum of its proper divisors (3095079097).

21154254023 is an equidigital number, since it uses as much as digits as its factorization.

21154254023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9130357.

The product of its (nonzero) digits is 9600, while the sum is 29.

Adding to 21154254023 its reverse (32045245112), we get a palindrome (53199499135).

The spelling of 21154254023 in words is "twenty-one billion, one hundred fifty-four million, two hundred fifty-four thousand, twenty-three".