21546534 has 16 divisors (see below), whose sum is σ = 43684272. Its totient is φ = 7083648.

The previous prime is 21546533. The next prime is 21546557. The reversal of 21546534 is 43564512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21546533) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24159 + ... + 25034.

It is an arithmetic number, because the mean of its divisors is an integer number (2730267).

Almost surely, 2^21546534 is an apocalyptic number.

21546534 is an abundant number, since it is smaller than the sum of its proper divisors (22137738).

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

21546534 is a wasteful number, since it uses less digits than its factorization.

21546534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49271.

The product of its digits is 14400, while the sum is 30.

The square root of 21546534 is about 4641.8244258050. The cubic root of 21546534 is about 278.2653557283.

The spelling of 21546534 in words is "twenty-one million, five hundred forty-six thousand, five hundred thirty-four".