21085582453 has 16 divisors (see below), whose sum is σ = 23070234880. Its totient is φ = 19154356416.

The previous prime is 21085582439. The next prime is 21085582493. The reversal of 21085582453 is 35428558012.

It is not a de Polignac number, because 21085582453 - 2¹³ = 21085574261 is a prime.

It is a super-2 number, since 2×21085582453² (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 (21085582433) 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, 281851 + ... + 348727.

It is an arithmetic number, because the mean of its divisors is an integer number (1441889680).

Almost surely, 2^21085582453 is an apocalyptic number.

It is an amenable number.

21085582453 is a deficient number, since it is larger than the sum of its proper divisors (1984652427).

21085582453 is a wasteful number, since it uses less digits than its factorization.

21085582453 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67276.

The product of its (nonzero) digits is 384000, while the sum is 43.

The spelling of 21085582453 in words is "twenty-one billion, eighty-five million, five hundred eighty-two thousand, four hundred fifty-three".