21620620442346 has 8 divisors (see below), whose sum is σ = 43241240884704. Its totient is φ = 7206873480780.

The previous prime is 21620620442329. The next prime is 21620620442413. The reversal of 21620620442346 is 64324402602612.

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

21620620442346 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21620620442298 and 21620620442307.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1801718370190 + ... + 1801718370201.

It is an arithmetic number, because the mean of its divisors is an integer number (5405155110588).

Almost surely, 2^{21620620442346} is an apocalyptic number.

21620620442346 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21620620442346 is a wasteful number, since it uses less digits than its factorization.

21620620442346 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3603436740396.

The product of its (nonzero) digits is 663552, while the sum is 42.

The spelling of 21620620442346 in words is "twenty-one trillion, six hundred twenty billion, six hundred twenty million, four hundred forty-two thousand, three hundred forty-six".