21152515260350 has 96 divisors (see below), whose sum is σ = 43188212714976. Its totient is φ = 7675468697600.

The previous prime is 21152515260343. The next prime is 21152515260407. The reversal of 21152515260350 is 5306251525112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 763829 + ... + 6548928.

It is an arithmetic number, because the mean of its divisors is an integer number (449877215781).

Almost surely, 2^{21152515260350} is an apocalyptic number.

21152515260350 is an abundant number, since it is smaller than the sum of its proper divisors (22035697454626).

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

21152515260350 is a wasteful number, since it uses less digits than its factorization.

21152515260350 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7312910 (or 7312905 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 38.

Adding to 21152515260350 its reverse (5306251525112), we get a palindrome (26458766785462).

The spelling of 21152515260350 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred fifteen million, two hundred sixty thousand, three hundred fifty".