21101102331 has 16 divisors (see below), whose sum is σ = 28969543200. Its totient is φ = 13651987968.

The previous prime is 21101102329. The next prime is 21101102383. The reversal of 21101102331 is 13320110112.

It is a happy number.

It is not a de Polignac number, because 21101102331 - 2¹ = 21101102329 is a prime.

It is a super-2 number, since 2×21101102331² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21101102331.

It is not an unprimeable number, because it can be changed into a prime (21101102311) 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, 201166 + ... + 287523.

It is an arithmetic number, because the mean of its divisors is an integer number (1810596450).

Almost surely, 2^21101102331 is an apocalyptic number.

21101102331 is a deficient number, since it is larger than the sum of its proper divisors (7868440869).

21101102331 is a wasteful number, since it uses less digits than its factorization.

21101102331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489118.

The product of its (nonzero) digits is 36, while the sum is 15.

Adding to 21101102331 its reverse (13320110112), we get a palindrome (34421212443).

The spelling of 21101102331 in words is "twenty-one billion, one hundred one million, one hundred two thousand, three hundred thirty-one".