21115515630450 has 48 divisors (see below), whose sum is σ = 52375430945376. Its totient is φ = 5629841568000.

The previous prime is 21115515630431. The next prime is 21115515630541. The reversal of 21115515630450 is 5403651551112.

It is a junction number, because it is equal to n+sod(n) for n = 21115515630399 and 21115515630408.

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, 11151927 + ... + 12907226.

It is an arithmetic number, because the mean of its divisors is an integer number (1091154811362).

Almost surely, 2^{21115515630450} is an apocalyptic number.

21115515630450 is an abundant number, since it is smaller than the sum of its proper divisors (31259915314926).

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

21115515630450 is a wasteful number, since it uses less digits than its factorization.

21115515630450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24065019 (or 24065014 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 39.

The spelling of 21115515630450 in words is "twenty-one trillion, one hundred fifteen billion, five hundred fifteen million, six hundred thirty thousand, four hundred fifty".