21154463239 has 16 divisors (see below), whose sum is σ = 26043179008. Its totient is φ = 16733151072.

The previous prime is 21154463227. The next prime is 21154463243. The reversal of 21154463239 is 93236445112.

It is a cyclic number.

It is not a de Polignac number, because 21154463239 - 2²¹ = 21152366087 is a prime.

It is a super-2 number, since 2×21154463239² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21154463249) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 337594 + ... + 395320.

It is an arithmetic number, because the mean of its divisors is an integer number (1627698688).

Almost surely, 2^21154463239 is an apocalyptic number.

21154463239 is a deficient number, since it is larger than the sum of its proper divisors (4888715769).

21154463239 is a wasteful number, since it uses less digits than its factorization.

21154463239 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61774.

The product of its digits is 155520, while the sum is 40.

The spelling of 21154463239 in words is "twenty-one billion, one hundred fifty-four million, four hundred sixty-three thousand, two hundred thirty-nine".