21502316465252 has 12 divisors (see below), whose sum is σ = 43004632930560. Its totient is φ = 9215278485096.

The previous prime is 21502316465233. The next prime is 21502316465261. The reversal of 21502316465252 is 25256461320512.

It is a happy number.

21502316465252 is an admirable number.

It is a super-2 number, since 2×21502316465252² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 383969936852 + ... + 383969936907.

It is an arithmetic number, because the mean of its divisors is an integer number (3583719410880).

Almost surely, 2^{21502316465252} is an apocalyptic number.

It is an amenable number.

21502316465252 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21502316465252 is a wasteful number, since it uses less digits than its factorization.

21502316465252 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 767939873770 (or 767939873768 counting only the distinct ones).

The product of its (nonzero) digits is 864000, while the sum is 44.

Adding to 21502316465252 its reverse (25256461320512), we get a palindrome (46758777785764).

The spelling of 21502316465252 in words is "twenty-one trillion, five hundred two billion, three hundred sixteen million, four hundred sixty-five thousand, two hundred fifty-two".