21101200331 has 4 divisors (see below), whose sum is σ = 21227554992. Its totient is φ = 20974845672.

The previous prime is 21101200319. The next prime is 21101200333. The reversal of 21101200331 is 13300210112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21101200331 - 2¹⁰ = 21101199307 is a prime.

It is a super-2 number, since 2×21101200331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21101200333) 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, 63177080 + ... + 63177413.

It is an arithmetic number, because the mean of its divisors is an integer number (5306888748).

Almost surely, 2^21101200331 is an apocalyptic number.

21101200331 is a deficient number, since it is larger than the sum of its proper divisors (126354661).

21101200331 is a wasteful number, since it uses less digits than its factorization.

21101200331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 126354660.

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

Adding to 21101200331 its reverse (13300210112), we get a palindrome (34401410443).

The spelling of 21101200331 in words is "twenty-one billion, one hundred one million, two hundred thousand, three hundred thirty-one".