21101036 has 12 divisors (see below), whose sum is σ = 40283880. Its totient is φ = 9591360.

The previous prime is 21101033. The next prime is 21101123. The reversal of 21101036 is 63010112.

It is a self number, because there is not a number n which added to its sum of digits gives 21101036.

It is not an unprimeable number, because it can be changed into a prime (21101033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 239741 + ... + 239828.

It is an arithmetic number, because the mean of its divisors is an integer number (3356990).

Almost surely, 2^21101036 is an apocalyptic number.

It is an amenable number.

21101036 is a deficient number, since it is larger than the sum of its proper divisors (19182844).

21101036 is a wasteful number, since it uses less digits than its factorization.

21101036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 479584 (or 479582 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 14.

The square root of 21101036 is about 4593.5863984473. The cubic root of 21101036 is about 276.3341713030.

Adding to 21101036 its reverse (63010112), we get a palindrome (84111148).

The spelling of 21101036 in words is "twenty-one million, one hundred one thousand, thirty-six".