99021511209 has 16 divisors (see below), whose sum is σ = 139801716288. Its totient is φ = 62128192512.

The previous prime is 99021511189. The next prime is 99021511279. The reversal of 99021511209 is 90211512099.

It is not a de Polignac number, because 99021511209 - 2⁸ = 99021510953 is a prime.

It is a super-2 number, since 2×99021511209² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (99021511279) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1627474 + ... + 1687220.

It is an arithmetic number, because the mean of its divisors is an integer number (8737607268).

Almost surely, 2^99021511209 is an apocalyptic number.

It is an amenable number.

99021511209 is a deficient number, since it is larger than the sum of its proper divisors (40780205079).

99021511209 is a wasteful number, since it uses less digits than its factorization.

99021511209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92264.

The product of its (nonzero) digits is 14580, while the sum is 39.

The spelling of 99021511209 in words is "ninety-nine billion, twenty-one million, five hundred eleven thousand, two hundred nine".