21501134 has 16 divisors (see below), whose sum is σ = 32972400. Its totient is φ = 10512384.

The previous prime is 21501131. The next prime is 21501187. The reversal of 21501134 is 43110512.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21501131) 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, 29972 + ... + 30680.

It is an arithmetic number, because the mean of its divisors is an integer number (2060775).

Almost surely, 2^21501134 is an apocalyptic number.

21501134 is a deficient number, since it is larger than the sum of its proper divisors (11471266).

21501134 is a wasteful number, since it uses less digits than its factorization.

21501134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027.

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21501134 is about 4636.9315285003. The cubic root of 21501134 is about 278.0697770088.

Adding to 21501134 its reverse (43110512), we get a palindrome (64611646).

The spelling of 21501134 in words is "twenty-one million, five hundred one thousand, one hundred thirty-four".