21106052 has 24 divisors (see below), whose sum is σ = 40851552. Its totient is φ = 9460800.

The previous prime is 21106051. The next prime is 21106067. The reversal of 21106052 is 25060112.

It is a self number, because there is not a number n which added to its sum of digits gives 21106052.

It is not an unprimeable number, because it can be changed into a prime (21106051) 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, 74 + ... + 6497.

It is an arithmetic number, because the mean of its divisors is an integer number (1702148).

Almost surely, 2^21106052 is an apocalyptic number.

21106052 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21106052 is a deficient number, since it is larger than the sum of its proper divisors (19745500).

21106052 is a wasteful number, since it uses less digits than its factorization.

21106052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6659 (or 6657 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 17.

The square root of 21106052 is about 4594.1323446327. The cubic root of 21106052 is about 276.3560656844.

Adding to 21106052 its reverse (25060112), we get a palindrome (46166164).

It can be divided in two parts, 211060 and 52, that added together give a palindrome (211112).

The spelling of 21106052 in words is "twenty-one million, one hundred six thousand, fifty-two".