21532546 has 8 divisors (see below), whose sum is σ = 36912960. Its totient is φ = 9228228.

The previous prime is 21532541. The next prime is 21532547. The reversal of 21532546 is 64523512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21532541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 769006 + ... + 769033.

It is an arithmetic number, because the mean of its divisors is an integer number (4614120).

Almost surely, 2^21532546 is an apocalyptic number.

21532546 is a deficient number, since it is larger than the sum of its proper divisors (15380414).

21532546 is a wasteful number, since it uses less digits than its factorization.

21532546 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1538048.

The product of its digits is 7200, while the sum is 28.

The square root of 21532546 is about 4640.3174460375. The cubic root of 21532546 is about 278.2051261123.

It can be divided in two parts, 215 and 32546, that added together give a square (32761 = 181²).

The spelling of 21532546 in words is "twenty-one million, five hundred thirty-two thousand, five hundred forty-six".