21531042052350 has 48 divisors (see below), whose sum is σ = 53420110737840. Its totient is φ = 5739124499200.

The previous prime is 21531042052339. The next prime is 21531042052363. The reversal of 21531042052350 is 5325024013512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30736431 + ... + 31429130.

It is an arithmetic number, because the mean of its divisors is an integer number (1112918973705).

Almost surely, 2^{21531042052350} is an apocalyptic number.

21531042052350 is an abundant number, since it is smaller than the sum of its proper divisors (31889068685490).

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

21531042052350 is a wasteful number, since it uses less digits than its factorization.

21531042052350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62167885 (or 62167880 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 33.

Adding to 21531042052350 its reverse (5325024013512), we get a palindrome (26856066065862).

The spelling of 21531042052350 in words is "twenty-one trillion, five hundred thirty-one billion, forty-two million, fifty-two thousand, three hundred fifty".