20899621729299 has 16 divisors (see below), whose sum is σ = 28004272128000. Its totient is φ = 13864084945536.

The previous prime is 20899621729291. The next prime is 20899621729319. The reversal of 20899621729299 is 99292712699802.

It is not a de Polignac number, because 20899621729299 - 2³ = 20899621729291 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20899621729299.

It is not an unprimeable number, because it can be changed into a prime (20899621729291) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5912499 + ... + 8761100.

It is an arithmetic number, because the mean of its divisors is an integer number (1750267008000).

Almost surely, 2^{20899621729299} is an apocalyptic number.

20899621729299 is a deficient number, since it is larger than the sum of its proper divisors (7104650398701).

20899621729299 is a wasteful number, since it uses less digits than its factorization.

20899621729299 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14675954.

The product of its (nonzero) digits is 317447424, while the sum is 75.

The spelling of 20899621729299 in words is "twenty trillion, eight hundred ninety-nine billion, six hundred twenty-one million, seven hundred twenty-nine thousand, two hundred ninety-nine".