21776734 has 8 divisors (see below), whose sum is σ = 37331568. Its totient is φ = 9332880.

The previous prime is 21776731. The next prime is 21776743. The reversal of 21776734 is 43767712.

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

It is a super-2 number, since 2×21776734² = 948452287413512, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21776693 and 21776702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21776731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 777727 + ... + 777754.

It is an arithmetic number, because the mean of its divisors is an integer number (4666446).

Almost surely, 2^21776734 is an apocalyptic number.

21776734 is a deficient number, since it is larger than the sum of its proper divisors (15554834).

21776734 is a wasteful number, since it uses less digits than its factorization.

21776734 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1555490.

The product of its digits is 49392, while the sum is 37.

The square root of 21776734 is about 4666.5548319933. The cubic root of 21776734 is about 279.2528294024.

It can be divided in two parts, 2177 and 6734, that added together give a triangular number (8911 = T₁₃₃).

The spelling of 21776734 in words is "twenty-one million, seven hundred seventy-six thousand, seven hundred thirty-four".