21354982 has 16 divisors (see below), whose sum is σ = 35425872. Its totient is φ = 9573120.

The previous prime is 21354979. The next prime is 21354989. The reversal of 21354982 is 28945312.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21354989) 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, 5043 + ... + 8254.

It is an arithmetic number, because the mean of its divisors is an integer number (2214117).

Almost surely, 2^21354982 is an apocalyptic number.

21354982 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21354982 is a deficient number, since it is larger than the sum of its proper divisors (14070890).

21354982 is a wasteful number, since it uses less digits than its factorization.

21354982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13383.

The product of its digits is 17280, while the sum is 34.

The square root of 21354982 is about 4621.1450961856. The cubic root of 21354982 is about 277.4382926938.

It can be divided in two parts, 2135 and 4982, that added together give a palindrome (7117).

The spelling of 21354982 in words is "twenty-one million, three hundred fifty-four thousand, nine hundred eighty-two".