21505242011350 has 12 divisors (see below), whose sum is σ = 39999750141204. Its totient is φ = 8602096804520.

The previous prime is 21505242011329. The next prime is 21505242011369. The reversal of 21505242011350 is 5311024250512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215052420064 + ... + 215052420163.

It is an arithmetic number, because the mean of its divisors is an integer number (3333312511767).

Almost surely, 2^{21505242011350} is an apocalyptic number.

21505242011350 is a deficient number, since it is larger than the sum of its proper divisors (18494508129854).

21505242011350 is a wasteful number, since it uses less digits than its factorization.

21505242011350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430104840239 (or 430104840234 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 31.

Adding to 21505242011350 its reverse (5311024250512), we get a palindrome (26816266261862).

The spelling of 21505242011350 in words is "twenty-one trillion, five hundred five billion, two hundred forty-two million, eleven thousand, three hundred fifty".