21101260 has 12 divisors (see below), whose sum is σ = 44312688. Its totient is φ = 8440496.

The previous prime is 21101257. The next prime is 21101263. The reversal of 21101260 is 6210112.

It is an interprime number because it is at equal distance from previous prime (21101257) and next prime (21101263).

It is a self number, because there is not a number n which added to its sum of digits gives 21101260.

It is not an unprimeable number, because it can be changed into a prime (21101263) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 527512 + ... + 527551.

It is an arithmetic number, because the mean of its divisors is an integer number (3692724).

Almost surely, 2^21101260 is an apocalyptic number.

21101260 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21101260 is an abundant number, since it is smaller than the sum of its proper divisors (23211428).

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

21101260 is a wasteful number, since it uses less digits than its factorization.

21101260 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1055072 (or 1055070 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 21101260 is about 4593.6107802033. The cubic root of 21101260 is about 276.3351491166.

Adding to 21101260 its reverse (6210112), we get a palindrome (27311372).

The spelling of 21101260 in words is "twenty-one million, one hundred one thousand, two hundred sixty".