21502443430542 has 32 divisors (see below), whose sum is σ = 43873508021760. Its totient is φ = 7023487199040.

The previous prime is 21502443430459. The next prime is 21502443430553. The reversal of 21502443430542 is 24503434420512.

It is a self number, because there is not a number n which added to its sum of digits gives 21502443430542.

It is a congruent number.

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, 96920134 + ... + 97141737.

It is an arithmetic number, because the mean of its divisors is an integer number (1371047125680).

Almost surely, 2^{21502443430542} is an apocalyptic number.

21502443430542 is an abundant number, since it is smaller than the sum of its proper divisors (22371064591218).

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

21502443430542 is a wasteful number, since it uses less digits than its factorization.

21502443430542 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 194062248.

The product of its (nonzero) digits is 460800, while the sum is 39.

The spelling of 21502443430542 in words is "twenty-one trillion, five hundred two billion, four hundred forty-three million, four hundred thirty thousand, five hundred forty-two".