21960060 has 24 divisors (see below), whose sum is σ = 61488336. Its totient is φ = 5856000.

The previous prime is 21960053. The next prime is 21960077. The reversal of 21960060 is 6006912.

It is a self number, because there is not a number n which added to its sum of digits gives 21960060.

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, 182941 + ... + 183060.

It is an arithmetic number, because the mean of its divisors is an integer number (2562014).

Almost surely, 2^21960060 is an apocalyptic number.

21960060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21960060 is an abundant number, since it is smaller than the sum of its proper divisors (39528276).

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

21960060 is a wasteful number, since it uses less digits than its factorization.

21960060 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 366013 (or 366011 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 24.

The square root of 21960060 is about 4686.1562073836. The cubic root of 21960060 is about 280.0342645143.

Adding to 21960060 its reverse (6006912), we get a palindrome (27966972).

The spelling of 21960060 in words is "twenty-one million, nine hundred sixty thousand, sixty".