21101021227 has 16 divisors (see below), whose sum is σ = 25460017632. Its totient is φ = 17228574720.

The previous prime is 21101021203. The next prime is 21101021243. The reversal of 21101021227 is 72212010112.

It is a cyclic number.

It is not a de Polignac number, because 21101021227 - 2¹⁵ = 21100988459 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101021297) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1988758 + ... + 1999339.

It is an arithmetic number, because the mean of its divisors is an integer number (1591251102).

Almost surely, 2^21101021227 is an apocalyptic number.

21101021227 is a deficient number, since it is larger than the sum of its proper divisors (4358996405).

21101021227 is a wasteful number, since it uses less digits than its factorization.

21101021227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3988158.

The product of its (nonzero) digits is 112, while the sum is 19.

Adding to 21101021227 its reverse (72212010112), we get a palindrome (93313031339).

The spelling of 21101021227 in words is "twenty-one billion, one hundred one million, twenty-one thousand, two hundred twenty-seven".