101533969721 has 2 divisors, whose sum is σ = 101533969722. Its totient is φ = 101533969720.

The previous prime is 101533969711. The next prime is 101533969741. The reversal of 101533969721 is 127969335101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 93874219321 + 7659750400 = 306389^2 + 87520^2 .

It is an emirp because it is prime and its reverse (127969335101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101533969721 - 2⁶ = 101533969657 is a prime.

It is not a weakly prime, because it can be changed into another prime (101533969711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50766984860 + 50766984861.

It is an arithmetic number, because the mean of its divisors is an integer number (50766984861).

Almost surely, 2^101533969721 is an apocalyptic number.

It is an amenable number.

101533969721 is a deficient number, since it is larger than the sum of its proper divisors (1).

101533969721 is an equidigital number, since it uses as much as digits as its factorization.

101533969721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 306180, while the sum is 47.

The spelling of 101533969721 in words is "one hundred one billion, five hundred thirty-three million, nine hundred sixty-nine thousand, seven hundred twenty-one".