22021613551 has 4 divisors (see below), whose sum is σ = 25167558352. Its totient is φ = 18875668752.

The previous prime is 22021613501. The next prime is 22021613659. The reversal of 22021613551 is 15531612022.

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 22021613551 - 2⁹ = 22021613039 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 (22021613501) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1572972390 + ... + 1572972403.

It is an arithmetic number, because the mean of its divisors is an integer number (6291889588).

Almost surely, 2^22021613551 is an apocalyptic number.

22021613551 is a deficient number, since it is larger than the sum of its proper divisors (3145944801).

22021613551 is an equidigital number, since it uses as much as digits as its factorization.

22021613551 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3145944800.

The product of its (nonzero) digits is 3600, while the sum is 28.

The spelling of 22021613551 in words is "twenty-two billion, twenty-one million, six hundred thirteen thousand, five hundred fifty-one".