22821534 has 16 divisors (see below), whose sum is σ = 50714640. Its totient is φ = 7607160.

The previous prime is 22821529. The next prime is 22821551. The reversal of 22821534 is 43512822.

It is a super-2 number, since 2×22821534² = 1041644828226312, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 22821498 and 22821507.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 211257 + ... + 211364.

It is an arithmetic number, because the mean of its divisors is an integer number (3169665).

Almost surely, 2^22821534 is an apocalyptic number.

22821534 is an abundant number, since it is smaller than the sum of its proper divisors (27893106).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

22821534 is a wasteful number, since it uses less digits than its factorization.

22821534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422632 (or 422626 counting only the distinct ones).

The product of its digits is 3840, while the sum is 27.

The square root of 22821534 is about 4777.1889223685. The cubic root of 22821534 is about 283.6492313622.

The spelling of 22821534 in words is "twenty-two million, eight hundred twenty-one thousand, five hundred thirty-four".