20331213103021 has 8 divisors (see below), whose sum is σ = 20428178671800. Its totient is φ = 20234422091520.

The previous prime is 20331213102983. The next prime is 20331213103043. The reversal of 20331213103021 is 12030131213302.

It can be written as a sum of positive squares in 4 ways, for example, as 8281560172900 + 12049652930121 = 2877770^2 + 3471261^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20331213103021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20331213102983 and 20331213103001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20331213103081) 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, 43405816 + ... + 43871713.

It is an arithmetic number, because the mean of its divisors is an integer number (2553522333975).

Almost surely, 2^{20331213103021} is an apocalyptic number.

It is an amenable number.

20331213103021 is a deficient number, since it is larger than the sum of its proper divisors (96965568779).

20331213103021 is an equidigital number, since it uses as much as digits as its factorization.

20331213103021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87278639.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 20331213103021 its reverse (12030131213302), we get a palindrome (32361344316323).

The spelling of 20331213103021 in words is "twenty trillion, three hundred thirty-one billion, two hundred thirteen million, one hundred three thousand, twenty-one".