21354486 has 16 divisors (see below), whose sum is σ = 42806784. Its totient is φ = 7101864.

The previous prime is 21354451. The next prime is 21354551. The reversal of 21354486 is 68445312.

It is a Curzon number.

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, 1066 + ... + 6621.

It is an arithmetic number, because the mean of its divisors is an integer number (2675424).

Almost surely, 2^21354486 is an apocalyptic number.

21354486 is an abundant number, since it is smaller than the sum of its proper divisors (21452298).

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

21354486 is a wasteful number, since it uses less digits than its factorization.

21354486 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8155.

The product of its digits is 23040, while the sum is 33.

The square root of 21354486 is about 4621.0914295218. The cubic root of 21354486 is about 277.4361447101.

Adding to 21354486 its reverse (68445312), we get a palindrome (89799798).

The spelling of 21354486 in words is "twenty-one million, three hundred fifty-four thousand, four hundred eighty-six".