21355466727550 has 48 divisors (see below), whose sum is σ = 42564426921072. Its totient is φ = 7942841177600.

The previous prime is 21355466727461. The next prime is 21355466727563. The reversal of 21355466727550 is 5572766455312.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 151279321 + ... + 151420420.

It is an arithmetic number, because the mean of its divisors is an integer number (886758894189).

Almost surely, 2^{21355466727550} is an apocalyptic number.

21355466727550 is a deficient number, since it is larger than the sum of its proper divisors (21208960193522).

21355466727550 is a wasteful number, since it uses less digits than its factorization.

21355466727550 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302699853 (or 302699848 counting only the distinct ones).

The product of its (nonzero) digits is 52920000, while the sum is 58.

The spelling of 21355466727550 in words is "twenty-one trillion, three hundred fifty-five billion, four hundred sixty-six million, seven hundred twenty-seven thousand, five hundred fifty".