201321100981 has 48 divisors (see below), whose sum is σ = 282569374080. Its totient is φ = 138510092160.

The previous prime is 201321100979. The next prime is 201321100991. The reversal of 201321100981 is 189001123102.

It is not a de Polignac number, because 201321100981 - 2¹ = 201321100979 is a prime.

It is a super-2 number, since 2×201321100981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201321100901) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 339435 + ... + 719623.

It is an arithmetic number, because the mean of its divisors is an integer number (5886861960).

Almost surely, 2^201321100981 is an apocalyptic number.

It is an amenable number.

201321100981 is a deficient number, since it is larger than the sum of its proper divisors (81248273099).

201321100981 is a wasteful number, since it uses less digits than its factorization.

201321100981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380266 (or 380243 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 28.

The spelling of 201321100981 in words is "two hundred one billion, three hundred twenty-one million, one hundred thousand, nine hundred eighty-one".