21312200998 has 16 divisors (see below), whose sum is σ = 35294688576. Its totient is φ = 9570648040.

The previous prime is 21312200989. The next prime is 21312200999. The reversal of 21312200998 is 89900221312.

It is a super-2 number, since 2×21312200998² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21312200999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5833936 + ... + 5837587.

It is an arithmetic number, because the mean of its divisors is an integer number (2205918036).

Almost surely, 2^21312200998 is an apocalyptic number.

21312200998 is a deficient number, since it is larger than the sum of its proper divisors (13982487578).

21312200998 is a wasteful number, since it uses less digits than its factorization.

21312200998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11671619.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 21312200998 in words is "twenty-one billion, three hundred twelve million, two hundred thousand, nine hundred ninety-eight".