21651650080954 has 8 divisors (see below), whose sum is σ = 32504698490580. Its totient is φ = 10816750584096.

The previous prime is 21651650080943. The next prime is 21651650080981. The reversal of 21651650080954 is 45908005615612.

It can be written as a sum of positive squares in 2 ways, for example, as 20906064459225 + 745585621729 = 4572315^2 + 863473^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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 3 ways as a sum of consecutive naturals, for example, 4537225209 + ... + 4537229980.

Almost surely, 2^{21651650080954} is an apocalyptic number.

21651650080954 is a deficient number, since it is larger than the sum of its proper divisors (10853048409626).

21651650080954 is a wasteful number, since it uses less digits than its factorization.

21651650080954 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9074456384.

The product of its (nonzero) digits is 2592000, while the sum is 52.

The spelling of 21651650080954 in words is "twenty-one trillion, six hundred fifty-one billion, six hundred fifty million, eighty thousand, nine hundred fifty-four".