21430245216550 has 12 divisors (see below), whose sum is σ = 39860256102876. Its totient is φ = 8572098086600.

The previous prime is 21430245216493. The next prime is 21430245216577. The reversal of 21430245216550 is 5561254203412.

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, 214302452116 + ... + 214302452215.

It is an arithmetic number, because the mean of its divisors is an integer number (3321688008573).

Almost surely, 2^{21430245216550} is an apocalyptic number.

21430245216550 is a deficient number, since it is larger than the sum of its proper divisors (18430010886326).

21430245216550 is a wasteful number, since it uses less digits than its factorization.

21430245216550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 428604904343 (or 428604904338 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 40.

Adding to 21430245216550 its reverse (5561254203412), we get a palindrome (26991499419962).

The spelling of 21430245216550 in words is "twenty-one trillion, four hundred thirty billion, two hundred forty-five million, two hundred sixteen thousand, five hundred fifty".