21434134 has 4 divisors (see below), whose sum is σ = 32151204. Its totient is φ = 10717066.

The previous prime is 21434131. The next prime is 21434143. The reversal of 21434134 is 43143412.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5358532 + ... + 5358535.

It is an arithmetic number, because the mean of its divisors is an integer number (8037801).

Almost surely, 2^21434134 is an apocalyptic number.

21434134 is a deficient number, since it is larger than the sum of its proper divisors (10717070).

21434134 is a wasteful number, since it uses less digits than its factorization.

21434134 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10717069.

The product of its digits is 1152, while the sum is 22.

The square root of 21434134 is about 4629.7012862603. The cubic root of 21434134 is about 277.7806440356.

Adding to 21434134 its reverse (43143412), we get a palindrome (64577546).

The spelling of 21434134 in words is "twenty-one million, four hundred thirty-four thousand, one hundred thirty-four".