21224060551 has 4 divisors (see below), whose sum is σ = 21230030952. Its totient is φ = 21218090152.

The previous prime is 21224060461. The next prime is 21224060587. The reversal of 21224060551 is 15506042212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21224060551 - 2¹¹ = 21224058503 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21224060591) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2979865 + ... + 2986978.

It is an arithmetic number, because the mean of its divisors is an integer number (5307507738).

Almost surely, 2^21224060551 is an apocalyptic number.

21224060551 is a deficient number, since it is larger than the sum of its proper divisors (5970401).

21224060551 is an equidigital number, since it uses as much as digits as its factorization.

21224060551 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5970400.

The product of its (nonzero) digits is 4800, while the sum is 28.

The spelling of 21224060551 in words is "twenty-one billion, two hundred twenty-four million, sixty thousand, five hundred fifty-one".