21117602 has 16 divisors (see below), whose sum is σ = 35491392. Its totient is φ = 9339120.

The previous prime is 21117563. The next prime is 21117631. The reversal of 21117602 is 20671112.

It is a super-2 number, since 2×21117602² = 891906228460808, which contains 22 as substring.

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, 12158 + ... + 13785.

It is an arithmetic number, because the mean of its divisors is an integer number (2218212).

Almost surely, 2^21117602 is an apocalyptic number.

21117602 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21117602 is a deficient number, since it is larger than the sum of its proper divisors (14373790).

21117602 is a wasteful number, since it uses less digits than its factorization.

21117602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25993.

The product of its (nonzero) digits is 168, while the sum is 20.

The square root of 21117602 is about 4595.3892109374. The cubic root of 21117602 is about 276.4064671915.

Adding to 21117602 its reverse (20671112), we get a palindrome (41788714).

It can be divided in two parts, 21 and 117602, that multiplied together give a palindrome (2469642).

The spelling of 21117602 in words is "twenty-one million, one hundred seventeen thousand, six hundred two".