21515445235030 has 64 divisors (see below), whose sum is σ = 41594973697152. Its totient is φ = 7983636756480.

The previous prime is 21515445234989. The next prime is 21515445235061. The reversal of 21515445235030 is 3053254451512.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 43653532 + ... + 44143648.

It is an arithmetic number, because the mean of its divisors is an integer number (649921464018).

Almost surely, 2^{21515445235030} is an apocalyptic number.

21515445235030 is a deficient number, since it is larger than the sum of its proper divisors (20079528462122).

21515445235030 is a wasteful number, since it uses less digits than its factorization.

21515445235030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 493849.

The product of its (nonzero) digits is 360000, while the sum is 40.

Adding to 21515445235030 its reverse (3053254451512), we get a palindrome (24568699686542).

The spelling of 21515445235030 in words is "twenty-one trillion, five hundred fifteen billion, four hundred forty-five million, two hundred thirty-five thousand, thirty".