21434451550542 has 32 divisors (see below), whose sum is σ = 48919469008800. Its totient is φ = 6951714015744.

The previous prime is 21434451550537. The next prime is 21434451550549. The reversal of 21434451550542 is 24505515443412.

21434451550542 is a `hidden beast` number, since 2 + 1 + 4 + 3 + 4 + 4 + 51 + 5 + 50 + 542 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21434451550549) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5363974867 + ... + 5363978862.

It is an arithmetic number, because the mean of its divisors is an integer number (1528733406525).

Almost surely, 2^{21434451550542} is an apocalyptic number.

21434451550542 is an abundant number, since it is smaller than the sum of its proper divisors (27485017458258).

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

21434451550542 is a wasteful number, since it uses less digits than its factorization.

21434451550542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10727953777 (or 10727953771 counting only the distinct ones).

The product of its (nonzero) digits is 1920000, while the sum is 45.

Adding to 21434451550542 its reverse (24505515443412), we get a palindrome (45939966993954).

The spelling of 21434451550542 in words is "twenty-one trillion, four hundred thirty-four billion, four hundred fifty-one million, five hundred fifty thousand, five hundred forty-two".