21473142 has 32 divisors (see below), whose sum is σ = 46946304. Its totient is φ = 6518400.

The previous prime is 21473107. The next prime is 21473147. The reversal of 21473142 is 24137412.

It is a happy number.

It is a super-2 number, since 2×21473142² = 922191654704328, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21473147) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 234 + ... + 6557.

It is an arithmetic number, because the mean of its divisors is an integer number (1467072).

Almost surely, 2^21473142 is an apocalyptic number.

21473142 is an abundant number, since it is smaller than the sum of its proper divisors (25473162).

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

21473142 is a wasteful number, since it uses less digits than its factorization.

21473142 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6844.

The product of its digits is 1344, while the sum is 24.

The square root of 21473142 is about 4633.9121700783. The cubic root of 21473142 is about 277.9490529968.

The spelling of 21473142 in words is "twenty-one million, four hundred seventy-three thousand, one hundred forty-two".