21214134 has 24 divisors (see below), whose sum is σ = 46059312. Its totient is φ = 7056720.

The previous prime is 21214133. The next prime is 21214139. The reversal of 21214134 is 43141212.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21214133) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11007 + ... + 12789.

It is an arithmetic number, because the mean of its divisors is an integer number (1919138).

Almost surely, 2^21214134 is an apocalyptic number.

21214134 is an abundant number, since it is smaller than the sum of its proper divisors (24845178).

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

21214134 is a wasteful number, since it uses less digits than its factorization.

21214134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2452 (or 2449 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 21214134 is about 4605.8803718725. The cubic root of 21214134 is about 276.8269934109.

Adding to 21214134 its reverse (43141212), we get a palindrome (64355346).

The spelling of 21214134 in words is "twenty-one million, two hundred fourteen thousand, one hundred thirty-four".