21434021112 has 32 divisors (see below), whose sum is σ = 61240060800. Its totient is φ = 6124005984.

The previous prime is 21434021111. The next prime is 21434021113. The reversal of 21434021112 is 21112043412.

It is an interprime number because it is at equal distance from previous prime (21434021111) and next prime (21434021113).

It is a super-2 number, since 2×21434021112² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434021111) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 63791562 + ... + 63791897.

It is an arithmetic number, because the mean of its divisors is an integer number (1913751900).

Almost surely, 2^21434021112 is an apocalyptic number.

It is an amenable number.

21434021112 is an abundant number, since it is smaller than the sum of its proper divisors (39806039688).

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

21434021112 is a wasteful number, since it uses less digits than its factorization.

21434021112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127583475 (or 127583471 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21434021112 its reverse (21112043412), we get a palindrome (42546064524).

The spelling of 21434021112 in words is "twenty-one billion, four hundred thirty-four million, twenty-one thousand, one hundred twelve".