21011102331 has 8 divisors (see below), whose sum is σ = 28015501824. Its totient is φ = 14007052200.

The previous prime is 21011102317. The next prime is 21011102389. The reversal of 21011102331 is 13320111012.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21011102331 - 2¹¹ = 21011100283 is a prime.

It is a super-2 number, since 2×21011102331² (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 21011102331.

It is not an unprimeable number, because it can be changed into a prime (21011103331) 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, 130890 + ... + 243216.

It is an arithmetic number, because the mean of its divisors is an integer number (3501937728).

Almost surely, 2^21011102331 is an apocalyptic number.

21011102331 is a deficient number, since it is larger than the sum of its proper divisors (7004399493).

21011102331 is a wasteful number, since it uses less digits than its factorization.

21011102331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174681.

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

Adding to 21011102331 its reverse (13320111012), we get a palindrome (34331213343).

The spelling of 21011102331 in words is "twenty-one billion, eleven million, one hundred two thousand, three hundred thirty-one".