21012131103011 has 4 divisors (see below), whose sum is σ = 21459197722272. Its totient is φ = 20565064483752.

The previous prime is 21012131103001. The next prime is 21012131103017. The reversal of 21012131103011 is 11030113121012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21012131103011 - 2⁶ = 21012131102947 is a prime.

It is a super-2 number, since 2×21012131103011² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21012131103017) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 223533309560 + ... + 223533309653.

It is an arithmetic number, because the mean of its divisors is an integer number (5364799430568).

Almost surely, 2^{21012131103011} is an apocalyptic number.

21012131103011 is a deficient number, since it is larger than the sum of its proper divisors (447066619261).

21012131103011 is an equidigital number, since it uses as much as digits as its factorization.

21012131103011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 447066619260.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 21012131103011 its reverse (11030113121012), we get a palindrome (32042244224023).

The spelling of 21012131103011 in words is "twenty-one trillion, twelve billion, one hundred thirty-one million, one hundred three thousand, eleven".