21522541052 has 24 divisors (see below), whose sum is σ = 39544775760. Its totient is φ = 10235111040.

The previous prime is 21522541049. The next prime is 21522541097. The reversal of 21522541052 is 25014522512.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (29).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1376849 + ... + 1392392.

It is an arithmetic number, because the mean of its divisors is an integer number (1647698990).

Almost surely, 2^21522541052 is an apocalyptic number.

It is an amenable number.

21522541052 is a deficient number, since it is larger than the sum of its proper divisors (18022234708).

21522541052 is a wasteful number, since it uses less digits than its factorization.

21522541052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769341 (or 2769339 counting only the distinct ones).

The product of its (nonzero) digits is 8000, while the sum is 29.

The spelling of 21522541052 in words is "twenty-one billion, five hundred twenty-two million, five hundred forty-one thousand, fifty-two".