21277734 has 16 divisors (see below), whose sum is σ = 42609072. Its totient is φ = 7083648.

The previous prime is 21277723. The next prime is 21277741. The reversal of 21277734 is 43777212.

It is a junction number, because it is equal to n+sod(n) for n = 21277695 and 21277704.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4482 + ... + 7914.

It is an arithmetic number, because the mean of its divisors is an integer number (2663067).

Almost surely, 2^21277734 is an apocalyptic number.

21277734 is an abundant number, since it is smaller than the sum of its proper divisors (21331338).

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

21277734 is a wasteful number, since it uses less digits than its factorization.

21277734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4471.

The product of its digits is 16464, while the sum is 33.

The square root of 21277734 is about 4612.7794224307. The cubic root of 21277734 is about 277.1033599686.

The spelling of 21277734 in words is "twenty-one million, two hundred seventy-seven thousand, seven hundred thirty-four".