21152061399 has 16 divisors (see below), whose sum is σ = 32239722240. Its totient is φ = 12083888640.

The previous prime is 21152061397. The next prime is 21152061409. The reversal of 21152061399 is 99316025112.

It is not a de Polignac number, because 21152061399 - 2¹ = 21152061397 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152061397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37194 + ... + 209015.

It is an arithmetic number, because the mean of its divisors is an integer number (2014982640).

Almost surely, 2^21152061399 is an apocalyptic number.

21152061399 is a deficient number, since it is larger than the sum of its proper divisors (11087660841).

21152061399 is a wasteful number, since it uses less digits than its factorization.

21152061399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 250310.

The product of its (nonzero) digits is 29160, while the sum is 39.

The spelling of 21152061399 in words is "twenty-one billion, one hundred fifty-two million, sixty-one thousand, three hundred ninety-nine".