21540005003442 has 32 divisors (see below), whose sum is σ = 43905548507904. Its totient is φ = 7043053363200.

The previous prime is 21540005003401. The next prime is 21540005003471. The reversal of 21540005003442 is 24430050004512.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 80046159 + ... + 80314802.

It is an arithmetic number, because the mean of its divisors is an integer number (1372048390872).

Almost surely, 2^{21540005003442} is an apocalyptic number.

21540005003442 is an abundant number, since it is smaller than the sum of its proper divisors (22365543504462).

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

21540005003442 is a wasteful number, since it uses less digits than its factorization.

21540005003442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160361394.

The product of its (nonzero) digits is 19200, while the sum is 30.

Adding to 21540005003442 its reverse (24430050004512), we get a palindrome (45970055007954).

The spelling of 21540005003442 in words is "twenty-one trillion, five hundred forty billion, five million, three thousand, four hundred forty-two".