21996734 has 16 divisors (see below), whose sum is σ = 33834240. Its totient is φ = 10721880.

The previous prime is 21996731. The next prime is 21996757. The reversal of 21996734 is 43769912.

It is a junction number, because it is equal to n+sod(n) for n = 21996691 and 21996700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21996731) 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, 14747 + ... + 16169.

It is an arithmetic number, because the mean of its divisors is an integer number (2114640).

Almost surely, 2^21996734 is an apocalyptic number.

21996734 is a deficient number, since it is larger than the sum of its proper divisors (11837506).

21996734 is a wasteful number, since it uses less digits than its factorization.

21996734 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615.

The product of its digits is 81648, while the sum is 41.

The square root of 21996734 is about 4690.0675901313. The cubic root of 21996734 is about 280.1900665302.

The spelling of 21996734 in words is "twenty-one million, nine hundred ninety-six thousand, seven hundred thirty-four".