21162651610452 has 48 divisors (see below), whose sum is σ = 53869658798592. Its totient is φ = 6412794842080.

The previous prime is 21162651610427. The next prime is 21162651610489. The reversal of 21162651610452 is 25401615626112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5020873 + ... + 8217935.

It is an arithmetic number, because the mean of its divisors is an integer number (1122284558304).

Almost surely, 2^{21162651610452} is an apocalyptic number.

21162651610452 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21162651610452 is an abundant number, since it is smaller than the sum of its proper divisors (32707007188140).

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

21162651610452 is a wasteful number, since it uses less digits than its factorization.

21162651610452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3247228 (or 3247226 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The spelling of 21162651610452 in words is "twenty-one trillion, one hundred sixty-two billion, six hundred fifty-one million, six hundred ten thousand, four hundred fifty-two".