20899621729375 has 80 divisors (see below), whose sum is σ = 27484200640512. Its totient is φ = 15856449840000.

The previous prime is 20899621729351. The next prime is 20899621729423. The reversal of 20899621729375 is 57392712699802.

It is not a de Polignac number, because 20899621729375 - 2³⁷ = 20762182775903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 3908660452 + ... + 3908665798.

Almost surely, 2^{20899621729375} is an apocalyptic number.

20899621729375 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

20899621729375 is a deficient number, since it is larger than the sum of its proper divisors (6584578911137).

20899621729375 is a wasteful number, since it uses less digits than its factorization.

20899621729375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7658 (or 7643 counting only the distinct ones).

The product of its (nonzero) digits is 205752960, while the sum is 70.

The spelling of 20899621729375 in words is "twenty trillion, eight hundred ninety-nine billion, six hundred twenty-one million, seven hundred twenty-nine thousand, three hundred seventy-five".