21501522323132 has 24 divisors (see below), whose sum is σ = 38279433736320. Its totient is φ = 10564674709680.

The previous prime is 21501522323077. The next prime is 21501522323153. The reversal of 21501522323132 is 23132322510512.

It is a happy number.

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, 16035848 + ... + 17324879.

It is an arithmetic number, because the mean of its divisors is an integer number (1594976405680).

Almost surely, 2^{21501522323132} is an apocalyptic number.

It is an amenable number.

21501522323132 is a deficient number, since it is larger than the sum of its proper divisors (16777911413188).

21501522323132 is a wasteful number, since it uses less digits than its factorization.

21501522323132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33363521 (or 33363519 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 32.

Adding to 21501522323132 its reverse (23132322510512), we get a palindrome (44633844833644).

The spelling of 21501522323132 in words is "twenty-one trillion, five hundred one billion, five hundred twenty-two million, three hundred twenty-three thousand, one hundred thirty-two".