21350452 has 12 divisors (see below), whose sum is σ = 39329920. Its totient is φ = 10113336.

The previous prime is 21350437. The next prime is 21350479. The reversal of 21350452 is 25405312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140388 + ... + 140539.

Almost surely, 2^21350452 is an apocalyptic number.

It is an amenable number.

21350452 is a deficient number, since it is larger than the sum of its proper divisors (17979468).

21350452 is a wasteful number, since it uses less digits than its factorization.

21350452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280950 (or 280948 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 21350452 is about 4620.6549319334. The cubic root of 21350452 is about 277.4186737848.

Adding to 21350452 its reverse (25405312), we get a palindrome (46755764).

The spelling of 21350452 in words is "twenty-one million, three hundred fifty thousand, four hundred fifty-two".