21034544 has 10 divisors (see below), whose sum is σ = 40754460. Its totient is φ = 10517264.

The previous prime is 21034543. The next prime is 21034561. The reversal of 21034544 is 44543012.

It is not an unprimeable number, because it can be changed into a prime (21034543) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 657314 + ... + 657345.

It is an arithmetic number, because the mean of its divisors is an integer number (4075446).

Almost surely, 2^21034544 is an apocalyptic number.

It is an amenable number.

21034544 is a deficient number, since it is larger than the sum of its proper divisors (19719916).

21034544 is a wasteful number, since it uses less digits than its factorization.

21034544 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1314667 (or 1314661 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

The square root of 21034544 is about 4586.3432056487. The cubic root of 21034544 is about 276.0436113960.

Adding to 21034544 its reverse (44543012), we get a palindrome (65577556).

The spelling of 21034544 in words is "twenty-one million, thirty-four thousand, five hundred forty-four".