21973434 has 16 divisors (see below), whose sum is σ = 50225088. Its totient is φ = 6278112.

The previous prime is 21973433. The next prime is 21973453. The reversal of 21973434 is 43437912.

It is a junction number, because it is equal to n+sod(n) for n = 21973395 and 21973404.

It is not an unprimeable number, because it can be changed into a prime (21973433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 261547 + ... + 261630.

It is an arithmetic number, because the mean of its divisors is an integer number (3139068).

Almost surely, 2^21973434 is an apocalyptic number.

21973434 is an abundant number, since it is smaller than the sum of its proper divisors (28251654).

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

21973434 is a wasteful number, since it uses less digits than its factorization.

21973434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523189.

The product of its digits is 18144, while the sum is 33.

The square root of 21973434 is about 4687.5829592659. The cubic root of 21973434 is about 280.0911013083.

The spelling of 21973434 in words is "twenty-one million, nine hundred seventy-three thousand, four hundred thirty-four".