21351354 has 16 divisors (see below), whose sum is σ = 45214848. Its totient is φ = 6698432.

The previous prime is 21351353. The next prime is 21351361. The reversal of 21351354 is 45315312.

It is not an unprimeable number, because it can be changed into a prime (21351353) 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, 104562 + ... + 104765.

It is an arithmetic number, because the mean of its divisors is an integer number (2825928).

Almost surely, 2^21351354 is an apocalyptic number.

21351354 is an abundant number, since it is smaller than the sum of its proper divisors (23863494).

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

21351354 is a wasteful number, since it uses less digits than its factorization.

21351354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209349.

The product of its digits is 1800, while the sum is 24.

The square root of 21351354 is about 4620.7525361136. The cubic root of 21351354 is about 277.4225804643.

Adding to 21351354 its reverse (45315312), we get a palindrome (66666666).

The spelling of 21351354 in words is "twenty-one million, three hundred fifty-one thousand, three hundred fifty-four".