21097738 has 8 divisors (see below), whose sum is σ = 31676832. Its totient is φ = 10538796.

The previous prime is 21097723. The next prime is 21097753. The reversal of 21097738 is 83779012.

It is an interprime number because it is at equal distance from previous prime (21097723) and next prime (21097753).

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

It is a super-2 number, since 2×21097738² = 890229097433288, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21097697 and 21097706.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2070 + ... + 6817.

It is an arithmetic number, because the mean of its divisors is an integer number (3959604).

Almost surely, 2^21097738 is an apocalyptic number.

21097738 is a deficient number, since it is larger than the sum of its proper divisors (10579094).

21097738 is a wasteful number, since it uses less digits than its factorization.

21097738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10076.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 21097738 is about 4593.2274056485. The cubic root of 21097738 is about 276.3197739439.

The spelling of 21097738 in words is "twenty-one million, ninety-seven thousand, seven hundred thirty-eight".