21435111992 has 64 divisors (see below), whose sum is σ = 46453176000. Its totient is φ = 9082515456.

The previous prime is 21435111967. The next prime is 21435112003. The reversal of 21435111992 is 29911153412.

It is a super-2 number, since 2×21435111992² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9282134 + ... + 9284442.

It is an arithmetic number, because the mean of its divisors is an integer number (725830875).

Almost surely, 2^21435111992 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21435111992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23226588000).

21435111992 is an abundant number, since it is smaller than the sum of its proper divisors (25018064008).

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

21435111992 is a wasteful number, since it uses less digits than its factorization.

21435111992 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4128 (or 4124 counting only the distinct ones).

The product of its digits is 19440, while the sum is 38.

The spelling of 21435111992 in words is "twenty-one billion, four hundred thirty-five million, one hundred eleven thousand, nine hundred ninety-two".