21340003471542 has 40 divisors (see below), whose sum is σ = 54648474501456. Its totient is φ = 6097143848688.

The previous prime is 21340003471511. The next prime is 21340003471561. The reversal of 21340003471542 is 24517430004312.

21340003471542 is a `hidden beast` number, since 2 + 1 + 3 + 40 + 0 + 0 + 3 + 4 + 71 + 542 = 666.

It is a super-2 number, since 2×21340003471542² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21340003471497 and 21340003471506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 9409171473 + ... + 9409173740.

Almost surely, 2^{21340003471542} is an apocalyptic number.

21340003471542 is an abundant number, since it is smaller than the sum of its proper divisors (33308471029914).

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

21340003471542 is a wasteful number, since it uses less digits than its factorization.

21340003471542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18818345234 (or 18818345225 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 36.

Adding to 21340003471542 its reverse (24517430004312), we get a palindrome (45857433475854).

The spelling of 21340003471542 in words is "twenty-one trillion, three hundred forty billion, three million, four hundred seventy-one thousand, five hundred forty-two".