21472989438 has 8 divisors (see below), whose sum is σ = 42945978888. Its totient is φ = 7157663144.

The previous prime is 21472989383. The next prime is 21472989469. The reversal of 21472989438 is 83498927412.

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

21472989438 is an admirable number.

It is a super-2 number, since 2×21472989438² (a number of 21 digits) contains 22 as substring.

It is an alternating number because its digits alternate between even and odd.

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, 1789415781 + ... + 1789415792.

It is an arithmetic number, because the mean of its divisors is an integer number (5368247361).

Almost surely, 2^21472989438 is an apocalyptic number.

21472989438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21472989438 is a wasteful number, since it uses less digits than its factorization.

21472989438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3578831578.

The product of its digits is 6967296, while the sum is 57.

The spelling of 21472989438 in words is "twenty-one billion, four hundred seventy-two million, nine hundred eighty-nine thousand, four hundred thirty-eight".