101231219981 has 2 divisors, whose sum is σ = 101231219982. Its totient is φ = 101231219980.

The previous prime is 101231219939. The next prime is 101231220023. The reversal of 101231219981 is 189912132101.

It is a balanced prime because it is at equal distance from previous prime (101231219939) and next prime (101231220023).

It can be written as a sum of positive squares in only one way, i.e., 53022430756 + 48208789225 = 230266^2 + 219565^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-101231219981 is a prime.

It is a super-2 number, since 2×101231219981² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101231249981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50615609990 + 50615609991.

It is an arithmetic number, because the mean of its divisors is an integer number (50615609991).

Almost surely, 2^101231219981 is an apocalyptic number.

It is an amenable number.

101231219981 is a deficient number, since it is larger than the sum of its proper divisors (1).

101231219981 is an equidigital number, since it uses as much as digits as its factorization.

101231219981 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 38.

The spelling of 101231219981 in words is "one hundred one billion, two hundred thirty-one million, two hundred nineteen thousand, nine hundred eighty-one".