99921533 has 2 divisors, whose sum is σ = 99921534. Its totient is φ = 99921532.

The previous prime is 99921517. The next prime is 99921607. The reversal of 99921533 is 33512999.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 85618009 + 14303524 = 9253^2 + 3782^2 .

It is a cyclic number.

It is not a de Polignac number, because 99921533 - 2⁴ = 99921517 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (99924533) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49960766 + 49960767.

It is an arithmetic number, because the mean of its divisors is an integer number (49960767).

Almost surely, 2^99921533 is an apocalyptic number.

It is an amenable number.

99921533 is a deficient number, since it is larger than the sum of its proper divisors (1).

99921533 is an equidigital number, since it uses as much as digits as its factorization.

99921533 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65610, while the sum is 41.

The square root of 99921533 is about 9996.0758800641. The cubic root of 99921533 is about 464.0374477431.

The spelling of 99921533 in words is "ninety-nine million, nine hundred twenty-one thousand, five hundred thirty-three".