21450070 has 16 divisors (see below), whose sum is σ = 38689488. Its totient is φ = 8562400.

The previous prime is 21450061. The next prime is 21450083. The reversal of 21450070 is 7005412.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3645 + ... + 7495.

It is an arithmetic number, because the mean of its divisors is an integer number (2418093).

Almost surely, 2^21450070 is an apocalyptic number.

21450070 is a deficient number, since it is larger than the sum of its proper divisors (17239418).

21450070 is a wasteful number, since it uses less digits than its factorization.

21450070 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4415.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 21450070 is about 4631.4220278441. The cubic root of 21450070 is about 277.8494690809.

Adding to 21450070 its reverse (7005412), we get a palindrome (28455482).

The spelling of 21450070 in words is "twenty-one million, four hundred fifty thousand, seventy".