21101300031 has 48 divisors (see below), whose sum is σ = 34194043136. Its totient is φ = 11336315904.

The previous prime is 21101300029. The next prime is 21101300047. The reversal of 21101300031 is 13000310112.

It is not a de Polignac number, because 21101300031 - 2¹ = 21101300029 is a prime.

It is a super-2 number, since 2×21101300031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21101300071) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9873195 + ... + 9875331.

Almost surely, 2^21101300031 is an apocalyptic number.

21101300031 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

21101300031 is a deficient number, since it is larger than the sum of its proper divisors (13092743105).

21101300031 is a wasteful number, since it uses less digits than its factorization.

21101300031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3808 (or 3791 counting only the distinct ones).

The product of its (nonzero) digits is 18, while the sum is 12.

Adding to 21101300031 its reverse (13000310112), we get a palindrome (34101610143).

The spelling of 21101300031 in words is "twenty-one billion, one hundred one million, three hundred thousand, thirty-one".