221330313131 has 16 divisors (see below), whose sum is σ = 234146390400. Its totient is φ = 208632241728.

The previous prime is 221330313121. The next prime is 221330313133. The reversal of 221330313131 is 131313033122.

It is a cyclic number.

It is not a de Polignac number, because 221330313131 - 2³⁴ = 204150443947 is a prime.

It is a super-2 number, since 2×221330313131² (a number of 23 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 = 221330313097 and 221330313106.

It is not an unprimeable number, because it can be changed into a prime (221330313133) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6441860 + ... + 6476126.

It is an arithmetic number, because the mean of its divisors is an integer number (14634149400).

Almost surely, 2^221330313131 is an apocalyptic number.

221330313131 is a deficient number, since it is larger than the sum of its proper divisors (12816077269).

221330313131 is a wasteful number, since it uses less digits than its factorization.

221330313131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35978.

The product of its (nonzero) digits is 972, while the sum is 23.

Adding to 221330313131 its reverse (131313033122), we get a palindrome (352643346253).

The spelling of 221330313131 in words is "two hundred twenty-one billion, three hundred thirty million, three hundred thirteen thousand, one hundred thirty-one".