21620551613446 has 8 divisors (see below), whose sum is σ = 32600622328704. Its totient is φ = 10753677503880.

The previous prime is 21620551613417. The next prime is 21620551613449. The reversal of 21620551613446 is 64431615502612.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21620551613396 and 21620551613405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21620551613449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28299150945 + ... + 28299151708.

It is an arithmetic number, because the mean of its divisors is an integer number (4075077791088).

Almost surely, 2^{21620551613446} is an apocalyptic number.

21620551613446 is a deficient number, since it is larger than the sum of its proper divisors (10980070715258).

21620551613446 is a wasteful number, since it uses less digits than its factorization.

21620551613446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56598302846.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 21620551613446 in words is "twenty-one trillion, six hundred twenty billion, five hundred fifty-one million, six hundred thirteen thousand, four hundred forty-six".