21203231103113 has 4 divisors (see below), whose sum is σ = 21296637407760. Its totient is φ = 21109824798468.

The previous prime is 21203231103107. The next prime is 21203231103127. The reversal of 21203231103113 is 31130113230212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21203231103113 - 2¹⁶ = 21203231037577 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21203231102113) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46703151983 + ... + 46703152436.

It is an arithmetic number, because the mean of its divisors is an integer number (5324159351940).

Almost surely, 2^{21203231103113} is an apocalyptic number.

It is an amenable number.

21203231103113 is a deficient number, since it is larger than the sum of its proper divisors (93406304647).

21203231103113 is an equidigital number, since it uses as much as digits as its factorization.

21203231103113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93406304646.

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 21203231103113 its reverse (31130113230212), we get a palindrome (52333344333325).

The spelling of 21203231103113 in words is "twenty-one trillion, two hundred three billion, two hundred thirty-one million, one hundred three thousand, one hundred thirteen".