22051503521 has 4 divisors (see below), whose sum is σ = 22053144132. Its totient is φ = 22049862912.

The previous prime is 22051503457. The next prime is 22051503541. The reversal of 22051503521 is 12530515022.

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

It can be written as a sum of positive squares in 2 ways, for example, as 16450627600 + 5600875921 = 128260^2 + 74839^2 .

It is a cyclic number.

It is not a de Polignac number, because 22051503521 - 2⁶ = 22051503457 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22051503541) 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, 799976 + ... + 827081.

It is an arithmetic number, because the mean of its divisors is an integer number (5513286033).

Almost surely, 2^22051503521 is an apocalyptic number.

It is an amenable number.

22051503521 is a deficient number, since it is larger than the sum of its proper divisors (1640611).

22051503521 is a wasteful number, since it uses less digits than its factorization.

22051503521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1640610.

The product of its (nonzero) digits is 3000, while the sum is 26.

The spelling of 22051503521 in words is "twenty-two billion, fifty-one million, five hundred three thousand, five hundred twenty-one".