21930060 has 48 divisors (see below), whose sum is σ = 61651296. Its totient is φ = 5824512.

The previous prime is 21929993. The next prime is 21930101. The reversal of 21930060 is 6003912.

21930060 = 516² + 517² + ... + 587².

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, 18444 + ... + 19596.

It is an arithmetic number, because the mean of its divisors is an integer number (1284402).

Almost surely, 2^21930060 is an apocalyptic number.

21930060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21930060 is an abundant number, since it is smaller than the sum of its proper divisors (39721236).

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

21930060 is a wasteful number, since it uses less digits than its factorization.

21930060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482 (or 1480 counting only the distinct ones).

The product of its (nonzero) digits is 324, while the sum is 21.

The square root of 21930060 is about 4682.9541958042. The cubic root of 21930060 is about 279.9066865927.

Adding to 21930060 its reverse (6003912), we get a palindrome (27933972).

The spelling of 21930060 in words is "twenty-one million, nine hundred thirty thousand, sixty".