21160220 has 12 divisors (see below), whose sum is σ = 44436504. Its totient is φ = 8464080.

The previous prime is 21160211. The next prime is 21160231. The reversal of 21160220 is 2206112.

It is a junction number, because it is equal to n+sod(n) for n = 21160195 and 21160204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 528986 + ... + 529025.

It is an arithmetic number, because the mean of its divisors is an integer number (3703042).

Almost surely, 2^21160220 is an apocalyptic number.

21160220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21160220 is an abundant number, since it is smaller than the sum of its proper divisors (23276284).

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

21160220 is a wasteful number, since it uses less digits than its factorization.

21160220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1058020 (or 1058018 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 21160220 is about 4600.0239129813. The cubic root of 21160220 is about 276.5922833534.

Adding to 21160220 its reverse (2206112), we get a palindrome (23366332).

The spelling of 21160220 in words is "twenty-one million, one hundred sixty thousand, two hundred twenty".