21283797 has 8 divisors (see below), whose sum is σ = 29070720. Its totient is φ = 13843040.

The previous prime is 21283777. The next prime is 21283841. The reversal of 21283797 is 79738212.

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

It is a cyclic number.

It is not a de Polignac number, because 21283797 - 2¹² = 21279701 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21283777) 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, 86397 + ... + 86642.

It is an arithmetic number, because the mean of its divisors is an integer number (3633840).

Almost surely, 2^21283797 is an apocalyptic number.

It is an amenable number.

21283797 is a deficient number, since it is larger than the sum of its proper divisors (7786923).

21283797 is a wasteful number, since it uses less digits than its factorization.

21283797 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 173083.

The product of its digits is 42336, while the sum is 39.

The square root of 21283797 is about 4613.4365715809. The cubic root of 21283797 is about 277.1296772779.

The spelling of 21283797 in words is "twenty-one million, two hundred eighty-three thousand, seven hundred ninety-seven".