21032534 has 8 divisors (see below), whose sum is σ = 32920560. Its totient is φ = 10059016.

The previous prime is 21032533. The next prime is 21032537. The reversal of 21032534 is 43523012.

It is a happy number.

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

It is a super-2 number, since 2×21032534² = 884734972922312, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21032533) 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, 228569 + ... + 228660.

It is an arithmetic number, because the mean of its divisors is an integer number (4115070).

Almost surely, 2^21032534 is an apocalyptic number.

21032534 is a deficient number, since it is larger than the sum of its proper divisors (11888026).

21032534 is a wasteful number, since it uses less digits than its factorization.

21032534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457254.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 21032534 is about 4586.1240715881. The cubic root of 21032534 is about 276.0348184737.

Adding to 21032534 its reverse (43523012), we get a palindrome (64555546).

The spelling of 21032534 in words is "twenty-one million, thirty-two thousand, five hundred thirty-four".