99211021 has 16 divisors (see below), whose sum is σ = 125088768. Its totient is φ = 76579200.

The previous prime is 99210977. The next prime is 99211033. The reversal of 99211021 is 12011299.

It is a cyclic number.

It is not a de Polignac number, because 99211021 - 2⁷ = 99210893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99211061) 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, 9565 + ... + 17026.

It is an arithmetic number, because the mean of its divisors is an integer number (7818048).

Almost surely, 2^99211021 is an apocalyptic number.

99211021 is a gapful number since it is divisible by the number (91) formed by its first and last digit.

It is an amenable number.

99211021 is a deficient number, since it is larger than the sum of its proper divisors (25877747).

99211021 is a wasteful number, since it uses less digits than its factorization.

99211021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26652.

The product of its (nonzero) digits is 324, while the sum is 25.

The square root of 99211021 is about 9960.4729305390. The cubic root of 99211021 is about 462.9349534733.

The spelling of 99211021 in words is "ninety-nine million, two hundred eleven thousand, twenty-one".