21434345 has 8 divisors (see below), whose sum is σ = 25791360. Its totient is φ = 17100720.

The previous prime is 21434341. The next prime is 21434353. The reversal of 21434345 is 54343412.

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

It is not a de Polignac number, because 21434345 - 2² = 21434341 is a prime.

It is a super-2 number, since 2×21434345² = 918862291158050, which contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

It is not an unprimeable number, because it can be changed into a prime (21434341) 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, 3761 + ... + 7550.

It is an arithmetic number, because the mean of its divisors is an integer number (3223920).

Almost surely, 2^21434345 is an apocalyptic number.

It is an amenable number.

21434345 is a deficient number, since it is larger than the sum of its proper divisors (4357015).

21434345 is a wasteful number, since it uses less digits than its factorization.

21434345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11695.

The product of its digits is 5760, while the sum is 26.

The square root of 21434345 is about 4629.7240738515. The cubic root of 21434345 is about 277.7815555338.

Adding to 21434345 its reverse (54343412), we get a palindrome (75777757).

The spelling of 21434345 in words is "twenty-one million, four hundred thirty-four thousand, three hundred forty-five".