21152520043346 has 16 divisors (see below), whose sum is σ = 32853580306200. Its totient is φ = 10202008927488.

The previous prime is 21152520043331. The next prime is 21152520043373. The reversal of 21152520043346 is 64334002525112.

It can be written as a sum of positive squares in 4 ways, for example, as 20900340312721 + 252179730625 = 4571689^2 + 502175^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 170517335 + ... + 170641338.

Almost surely, 2^{21152520043346} is an apocalyptic number.

21152520043346 is a deficient number, since it is larger than the sum of its proper divisors (11701060262854).

21152520043346 is a wasteful number, since it uses less digits than its factorization.

21152520043346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341159773.

The product of its (nonzero) digits is 172800, while the sum is 38.

Adding to 21152520043346 its reverse (64334002525112), we get a palindrome (85486522568458).

The spelling of 21152520043346 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred twenty million, forty-three thousand, three hundred forty-six".