21152541251223 has 12 divisors (see below), whose sum is σ = 31685288129768. Its totient is φ = 14101694167320.

The previous prime is 21152541251209. The next prime is 21152541251243. The reversal of 21152541251223 is 32215214525112.

21152541251223 is a `hidden beast` number, since 2 + 1 + 1 + 525 + 4 + 1 + 2 + 5 + 122 + 3 = 666.

It is not a de Polignac number, because 21152541251223 - 2⁴ = 21152541251207 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152541251243) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 43523747188 + ... + 43523747673.

Almost surely, 2^{21152541251223} is an apocalyptic number.

21152541251223 is a deficient number, since it is larger than the sum of its proper divisors (10532746878545).

21152541251223 is an frugal number, since it uses more digits than its factorization.

21152541251223 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87047494876 (or 87047494864 counting only the distinct ones).

The product of its digits is 48000, while the sum is 36.

Adding to 21152541251223 its reverse (32215214525112), we get a palindrome (53367755776335).

The spelling of 21152541251223 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred forty-one million, two hundred fifty-one thousand, two hundred twenty-three".