21140004 has 48 divisors (see below), whose sum is σ = 51492672. Its totient is φ = 6744192.

The previous prime is 21140003. The next prime is 21140011. The reversal of 21140004 is 40004112.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (21140003) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26962 + ... + 27734.

It is an arithmetic number, because the mean of its divisors is an integer number (1072764).

Almost surely, 2^21140004 is an apocalyptic number.

It is an amenable number.

21140004 is an abundant number, since it is smaller than the sum of its proper divisors (30352668).

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

21140004 is a wasteful number, since it uses less digits than its factorization.

21140004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 876 (or 874 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 12.

The square root of 21140004 is about 4597.8260080173. The cubic root of 21140004 is about 276.5041719311.

Adding to 21140004 its reverse (40004112), we get a palindrome (61144116).

The spelling of 21140004 in words is "twenty-one million, one hundred forty thousand, four".