291221203113 has 24 divisors (see below), whose sum is σ = 424782483840. Its totient is φ = 192243754080.

The previous prime is 291221203073. The next prime is 291221203151. The reversal of 291221203113 is 311302122192.

It is not a de Polignac number, because 291221203113 - 2¹³ = 291221194921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (291221207113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1459158 + ... + 1646688.

It is an arithmetic number, because the mean of its divisors is an integer number (17699270160).

Almost surely, 2^291221203113 is an apocalyptic number.

It is an amenable number.

291221203113 is a deficient number, since it is larger than the sum of its proper divisors (133561280727).

291221203113 is a wasteful number, since it uses less digits than its factorization.

291221203113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189229 (or 189226 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

It can be divided in two parts, 2912 and 21203113, that added together give a square (21206025 = 4605²).

The spelling of 291221203113 in words is "two hundred ninety-one billion, two hundred twenty-one million, two hundred three thousand, one hundred thirteen".