21541060 has 24 divisors (see below), whose sum is σ = 47617920. Its totient is φ = 8162784.

The previous prime is 21541049. The next prime is 21541061. The reversal of 21541060 is 6014512.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is not an unprimeable number, because it can be changed into a prime (21541061) 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, 27964 + ... + 28723.

It is an arithmetic number, because the mean of its divisors is an integer number (1984080).

Almost surely, 2^21541060 is an apocalyptic number.

21541060 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21541060 is an abundant number, since it is smaller than the sum of its proper divisors (26076860).

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

21541060 is a wasteful number, since it uses less digits than its factorization.

21541060 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56715 (or 56713 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 21541060 is about 4641.2347495036. The cubic root of 21541060 is about 278.2417888510.

Adding to 21541060 its reverse (6014512), we get a palindrome (27555572).

The spelling of 21541060 in words is "twenty-one million, five hundred forty-one thousand, sixty".