21329434 has 8 divisors (see below), whose sum is σ = 36564768. Its totient is φ = 9141180.

The previous prime is 21329431. The next prime is 21329437. The reversal of 21329434 is 43492312.

It is an interprime number because it is at equal distance from previous prime (21329431) and next prime (21329437).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (21329431) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 761752 + ... + 761779.

It is an arithmetic number, because the mean of its divisors is an integer number (4570596).

Almost surely, 2^21329434 is an apocalyptic number.

21329434 is a deficient number, since it is larger than the sum of its proper divisors (15235334).

21329434 is a wasteful number, since it uses less digits than its factorization.

21329434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523540.

The product of its digits is 5184, while the sum is 28.

The square root of 21329434 is about 4618.3800190110. The cubic root of 21329434 is about 277.3276109186.

The spelling of 21329434 in words is "twenty-one million, three hundred twenty-nine thousand, four hundred thirty-four".