21240515132 has 12 divisors (see below), whose sum is σ = 37182528936. Its totient is φ = 10616935440.

The previous prime is 21240515123. The next prime is 21240515137. The reversal of 21240515132 is 23151504212.

It is a super-3 number, since 3×21240515132³ (a number of 32 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21240515137) 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, 816119 + ... + 841742.

It is an arithmetic number, because the mean of its divisors is an integer number (3098544078).

Almost surely, 2^21240515132 is an apocalyptic number.

It is an amenable number.

21240515132 is a deficient number, since it is larger than the sum of its proper divisors (15942013804).

21240515132 is a wasteful number, since it uses less digits than its factorization.

21240515132 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1661068 (or 1661066 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

The spelling of 21240515132 in words is "twenty-one billion, two hundred forty million, five hundred fifteen thousand, one hundred thirty-two".