21220111031131 has 4 divisors (see below), whose sum is σ = 21220232742000. Its totient is φ = 21219989320264.

The previous prime is 21220111031107. The next prime is 21220111031177. The reversal of 21220111031131 is 13113011102212.

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 21220111031131 - 2¹¹ = 21220111029083 is a prime.

It is a super-2 number, since 2×21220111031131² (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 = 21220111031099 and 21220111031108.

It is not an unprimeable number, because it can be changed into a prime (21220111931131) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60593536 + ... + 60942733.

It is an arithmetic number, because the mean of its divisors is an integer number (5305058185500).

Almost surely, 2^{21220111031131} is an apocalyptic number.

21220111031131 is a deficient number, since it is larger than the sum of its proper divisors (121710869).

21220111031131 is a wasteful number, since it uses less digits than its factorization.

21220111031131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 121710868.

The product of its (nonzero) digits is 72, while the sum is 19.

Adding to 21220111031131 its reverse (13113011102212), we get a palindrome (34333122133343).

The spelling of 21220111031131 in words is "twenty-one trillion, two hundred twenty billion, one hundred eleven million, thirty-one thousand, one hundred thirty-one".