21212110098 has 48 divisors (see below), whose sum is σ = 47078212896. Its totient is φ = 6898953600.

The previous prime is 21212110097. The next prime is 21212110109. The reversal of 21212110098 is 89001121212.

It is a super-3 number, since 3×21212110098³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is not an unprimeable number, because it can be changed into a prime (21212110097) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 742173 + ... + 770223.

It is an arithmetic number, because the mean of its divisors is an integer number (980796102).

Almost surely, 2^21212110098 is an apocalyptic number.

21212110098 is an abundant number, since it is smaller than the sum of its proper divisors (25866102798).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212110098 is a wasteful number, since it uses less digits than its factorization.

21212110098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29079 (or 29076 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 27.

The spelling of 21212110098 in words is "twenty-one billion, two hundred twelve million, one hundred ten thousand, ninety-eight".