21531453532 has 12 divisors (see below), whose sum is σ = 37681073640. Its totient is φ = 10765432496.

The previous prime is 21531453529. The next prime is 21531453533. The reversal of 21531453532 is 23535413512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21531453533) 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, 233094 + ... + 312082.

It is an arithmetic number, because the mean of its divisors is an integer number (3140089470).

Almost surely, 2^21531453532 is an apocalyptic number.

It is an amenable number.

21531453532 is a deficient number, since it is larger than the sum of its proper divisors (16149620108).

21531453532 is a wasteful number, since it uses less digits than its factorization.

21531453532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147140 (or 147138 counting only the distinct ones).

The product of its digits is 54000, while the sum is 34.

The spelling of 21531453532 in words is "twenty-one billion, five hundred thirty-one million, four hundred fifty-three thousand, five hundred thirty-two".