21255602453146 has 8 divisors (see below), whose sum is σ = 31957037407764. Its totient is φ = 10603256650560.

The previous prime is 21255602453123. The next prime is 21255602453227. The reversal of 21255602453146 is 64135420655212.

It can be written as a sum of positive squares in 2 ways, for example, as 21110909704921 + 144692748225 = 4594661^2 + 380385^2 .

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 = 21255602453096 and 21255602453105.

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, 12272286925 + ... + 12272288656.

Almost surely, 2^{21255602453146} is an apocalyptic number.

21255602453146 is a deficient number, since it is larger than the sum of its proper divisors (10701434954618).

21255602453146 is a wasteful number, since it uses less digits than its factorization.

21255602453146 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24544576016.

The product of its (nonzero) digits is 1728000, while the sum is 46.

The spelling of 21255602453146 in words is "twenty-one trillion, two hundred fifty-five billion, six hundred two million, four hundred fifty-three thousand, one hundred forty-six".