21434423004 has 72 divisors (see below), whose sum is σ = 57458877840. Its totient is φ = 6713943552.

The previous prime is 21434422949. The next prime is 21434423041. The reversal of 21434423004 is 40032443412.

It is a happy number.

21434423004 is a `hidden beast` number, since 2 + 14 + 344 + 2 + 300 + 4 = 666.

It is a super-3 number, since 3×21434423004³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 366282 + ... + 420750.

It is an arithmetic number, because the mean of its divisors is an integer number (798039970).

Almost surely, 2^21434423004 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 21434423004, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28729438920).

21434423004 is an abundant number, since it is smaller than the sum of its proper divisors (36024454836).

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

21434423004 is a wasteful number, since it uses less digits than its factorization.

21434423004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55139 (or 55134 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

Adding to 21434423004 its reverse (40032443412), we get a palindrome (61466866416).

The spelling of 21434423004 in words is "twenty-one billion, four hundred thirty-four million, four hundred twenty-three thousand, four".