21103220031 has 8 divisors (see below), whose sum is σ = 28143107760. Its totient is φ = 14066072832.

The previous prime is 21103220027. The next prime is 21103220041. The reversal of 21103220031 is 13002230112.

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

It is not a de Polignac number, because 21103220031 - 2² = 21103220027 is a prime.

It is a super-2 number, since 2×21103220031² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21103220041) 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, 667096 + ... + 698013.

It is an arithmetic number, because the mean of its divisors is an integer number (3517888470).

Almost surely, 2^21103220031 is an apocalyptic number.

21103220031 is a deficient number, since it is larger than the sum of its proper divisors (7039887729).

21103220031 is a wasteful number, since it uses less digits than its factorization.

21103220031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1370265.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 21103220031 its reverse (13002230112), we get a palindrome (34105450143).

The spelling of 21103220031 in words is "twenty-one billion, one hundred three million, two hundred twenty thousand, thirty-one".