99144950021 has 6 divisors (see below), whose sum is σ = 107358141330. Its totient is φ = 91518415248.

The previous prime is 99144949963. The next prime is 99144950041. The reversal of 99144950021 is 12005944199.

It can be written as a sum of positive squares in 3 ways, for example, as 398800900 + 98746149121 = 19970^2 + 314239^2 .

It is not a de Polignac number, because 99144950021 - 2⁶ = 99144949957 is a prime.

It is a super-2 number, since 2×99144950021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99144950041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 293328086 + ... + 293328423.

It is an arithmetic number, because the mean of its divisors is an integer number (17893023555).

Almost surely, 2^99144950021 is an apocalyptic number.

It is an amenable number.

99144950021 is a deficient number, since it is larger than the sum of its proper divisors (8213191309).

99144950021 is a wasteful number, since it uses less digits than its factorization.

99144950021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 586656535 (or 586656522 counting only the distinct ones).

The product of its (nonzero) digits is 116640, while the sum is 44.

The spelling of 99144950021 in words is "ninety-nine billion, one hundred forty-four million, nine hundred fifty thousand, twenty-one".