21001003113031 has 8 divisors (see below), whose sum is σ = 21751445520720. Its totient is φ = 20252312031168.

The previous prime is 21001003112989. The next prime is 21001003113071. The reversal of 21001003113031 is 13031130010012.

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

It is a cyclic number.

It is not a de Polignac number, because 21001003113031 - 2¹³ = 21001003104839 is a prime.

It is a super-2 number, since 2×21001003113031² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21001003112996 and 21001003113014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001003113071) 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, 437807046 + ... + 437855011.

It is an arithmetic number, because the mean of its divisors is an integer number (2718930690090).

Almost surely, 2^{21001003113031} is an apocalyptic number.

21001003113031 is a deficient number, since it is larger than the sum of its proper divisors (750442407689).

21001003113031 is an equidigital number, since it uses as much as digits as its factorization.

21001003113031 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 875662913.

The product of its (nonzero) digits is 54, while the sum is 16.

Adding to 21001003113031 its reverse (13031130010012), we get a palindrome (34032133123043).

The spelling of 21001003113031 in words is "twenty-one trillion, one billion, three million, one hundred thirteen thousand, thirty-one".