21348634 has 8 divisors (see below), whose sum is σ = 33906708. Its totient is φ = 10046400.

The previous prime is 21348629. The next prime is 21348637. The reversal of 21348634 is 43684312.

It can be written as a sum of positive squares in 2 ways, for example, as 21132409 + 216225 = 4597^2 + 465^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 21348596 and 21348605.

It is not an unprimeable number, because it can be changed into a prime (21348637) 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, 313917 + ... + 313984.

Almost surely, 2^21348634 is an apocalyptic number.

21348634 is a deficient number, since it is larger than the sum of its proper divisors (12558074).

21348634 is a wasteful number, since it uses less digits than its factorization.

21348634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 627920.

The product of its digits is 13824, while the sum is 31.

The square root of 21348634 is about 4620.4582023864. The cubic root of 21348634 is about 277.4107994556.

The spelling of 21348634 in words is "twenty-one million, three hundred forty-eight thousand, six hundred thirty-four".