21797358 has 32 divisors (see below), whose sum is σ = 47803392. Its totient is φ = 6571200.

The previous prime is 21797327. The next prime is 21797387. The reversal of 21797358 is 85379712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13978 + ... + 15458.

It is an arithmetic number, because the mean of its divisors is an integer number (1493856).

Almost surely, 2^21797358 is an apocalyptic number.

21797358 is an abundant number, since it is smaller than the sum of its proper divisors (26006034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21797358 is a wasteful number, since it uses less digits than its factorization.

21797358 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1720.

The product of its digits is 105840, while the sum is 42.

The square root of 21797358 is about 4668.7640762840. The cubic root of 21797358 is about 279.3409585216.

It can be divided in two parts, 21797 and 358, that added together give a triangular number (22155 = T₂₁₀).

The spelling of 21797358 in words is "twenty-one million, seven hundred ninety-seven thousand, three hundred fifty-eight".