21134004342 has 128 divisors (see below), whose sum is σ = 53628272640. Its totient is φ = 5461885440.

The previous prime is 21134004329. The next prime is 21134004371. The reversal of 21134004342 is 24340043112.

It is a super-2 number, since 2×21134004342² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 468763 + ... + 511865.

It is an arithmetic number, because the mean of its divisors is an integer number (418970880).

Almost surely, 2^21134004342 is an apocalyptic number.

21134004342 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 21134004342, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26814136320).

21134004342 is an abundant number, since it is smaller than the sum of its proper divisors (32494268298).

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

21134004342 is a wasteful number, since it uses less digits than its factorization.

21134004342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43178.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 21134004342 its reverse (24340043112), we get a palindrome (45474047454).

The spelling of 21134004342 in words is "twenty-one billion, one hundred thirty-four million, four thousand, three hundred forty-two".