21797342 has 16 divisors (see below), whose sum is σ = 37521792. Its totient is φ = 9303000.

The previous prime is 21797327. The next prime is 21797387. The reversal of 21797342 is 24379712.

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, 413 + ... + 6615.

It is an arithmetic number, because the mean of its divisors is an integer number (2345112).

Almost surely, 2^21797342 is an apocalyptic number.

21797342 is a deficient number, since it is larger than the sum of its proper divisors (15724450).

21797342 is a wasteful number, since it uses less digits than its factorization.

21797342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6463.

The product of its digits is 21168, while the sum is 35.

The square root of 21797342 is about 4668.7623627681. The cubic root of 21797342 is about 279.3408901730.

The spelling of 21797342 in words is "twenty-one million, seven hundred ninety-seven thousand, three hundred forty-two".