21598145469 has 24 divisors (see below), whose sum is σ = 32708075712. Its totient is φ = 13707429120.

The previous prime is 21598145461. The next prime is 21598145483. The reversal of 21598145469 is 96454189512.

21598145469 is a `hidden beast` number, since 2 + 1 + 5 + 98 + 1 + 4 + 546 + 9 = 666.

It is not a de Polignac number, because 21598145469 - 2³ = 21598145461 is a prime.

It is a super-2 number, since 2×21598145469² (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 (21598145461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 203572 + ... + 290925.

It is an arithmetic number, because the mean of its divisors is an integer number (1362836488).

Almost surely, 2^21598145469 is an apocalyptic number.

It is an amenable number.

21598145469 is a deficient number, since it is larger than the sum of its proper divisors (11109930243).

21598145469 is a wasteful number, since it uses less digits than its factorization.

21598145469 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 494737 (or 494734 counting only the distinct ones).

The product of its digits is 3110400, while the sum is 54.

The spelling of 21598145469 in words is "twenty-one billion, five hundred ninety-eight million, one hundred forty-five thousand, four hundred sixty-nine".