21152155156306 has 8 divisors (see below), whose sum is σ = 31766878574604. Its totient is φ = 10563195631440.

The previous prime is 21152155156267. The next prime is 21152155156309. The reversal of 21152155156306 is 60365155125112.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21143489222025 + 8665934281 = 4598205^2 + 93091^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21152155156309) 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, 6440971305 + ... + 6440974588.

Almost surely, 2^{21152155156306} is an apocalyptic number.

21152155156306 is a deficient number, since it is larger than the sum of its proper divisors (10614723418298).

21152155156306 is a wasteful number, since it uses less digits than its factorization.

21152155156306 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12881946716.

The product of its (nonzero) digits is 270000, while the sum is 43.

The spelling of 21152155156306 in words is "twenty-one trillion, one hundred fifty-two billion, one hundred fifty-five million, one hundred fifty-six thousand, three hundred six".