21573763552 has 24 divisors (see below), whose sum is σ = 46334561112. Its totient is φ = 9806256000.

The previous prime is 21573763543. The next prime is 21573763559. The reversal of 21573763552 is 25536737512.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21573763559) 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, 30644199 + ... + 30644902.

It is an arithmetic number, because the mean of its divisors is an integer number (1930606713).

Almost surely, 2^21573763552 is an apocalyptic number.

21573763552 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21573763552 is an abundant number, since it is smaller than the sum of its proper divisors (24760797560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21573763552 is a wasteful number, since it uses less digits than its factorization.

21573763552 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61289122 (or 61289114 counting only the distinct ones).

The product of its digits is 1323000, while the sum is 46.

The spelling of 21573763552 in words is "twenty-one billion, five hundred seventy-three million, seven hundred sixty-three thousand, five hundred fifty-two".