21212332998 has 32 divisors (see below), whose sum is σ = 45875994624. Its totient is φ = 6513255552.

The previous prime is 21212332997. The next prime is 21212333041. The reversal of 21212332998 is 89923321212.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212332997) 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, 2207590 + ... + 2217177.

It is an arithmetic number, because the mean of its divisors is an integer number (1433624832).

Almost surely, 2^21212332998 is an apocalyptic number.

21212332998 is an abundant number, since it is smaller than the sum of its proper divisors (24663661626).

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

21212332998 is a wasteful number, since it uses less digits than its factorization.

21212332998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4424836.

The product of its digits is 93312, while the sum is 42.

The spelling of 21212332998 in words is "twenty-one billion, two hundred twelve million, three hundred thirty-two thousand, nine hundred ninety-eight".