21450470 has 8 divisors (see below), whose sum is σ = 38610864. Its totient is φ = 8580184.

The previous prime is 21450461. The next prime is 21450479. The reversal of 21450470 is 7405412.

It is an interprime number because it is at equal distance from previous prime (21450461) and next prime (21450479).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21450479) 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, 1072514 + ... + 1072533.

It is an arithmetic number, because the mean of its divisors is an integer number (4826358).

Almost surely, 2^21450470 is an apocalyptic number.

21450470 is a deficient number, since it is larger than the sum of its proper divisors (17160394).

21450470 is a wasteful number, since it uses less digits than its factorization.

21450470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2145054.

The product of its (nonzero) digits is 1120, while the sum is 23.

The square root of 21450470 is about 4631.4652109241. The cubic root of 21450470 is about 277.8511961785.

Adding to 21450470 its reverse (7405412), we get a palindrome (28855882).

The spelling of 21450470 in words is "twenty-one million, four hundred fifty thousand, four hundred seventy".