20899621729424 has 40 divisors (see below), whose sum is σ = 40579429738368. Its totient is φ = 10427514289920.

The previous prime is 20899621729423. The next prime is 20899621729439. The reversal of 20899621729424 is 42492712699802.

It is not an unprimeable number, because it can be changed into a prime (20899621729423) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 103072589 + ... + 103275155.

Almost surely, 2^{20899621729424} is an apocalyptic number.

It is an amenable number.

20899621729424 is a deficient number, since it is larger than the sum of its proper divisors (19679808008944).

20899621729424 is a wasteful number, since it uses less digits than its factorization.

20899621729424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216303 (or 216297 counting only the distinct ones).

The product of its (nonzero) digits is 62705664, while the sum is 65.

The spelling of 20899621729424 in words is "twenty trillion, eight hundred ninety-nine billion, six hundred twenty-one million, seven hundred twenty-nine thousand, four hundred twenty-four".