21255241363346 has 4 divisors (see below), whose sum is σ = 31882862045022. Its totient is φ = 10627620681672.

The previous prime is 21255241363243. The next prime is 21255241363361. The reversal of 21255241363346 is 64336314255212.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 14732892339025 + 6522349024321 = 3838345^2 + 2553889^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 21255241363346.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5313810340835 + ... + 5313810340838.

Almost surely, 2^{21255241363346} is an apocalyptic number.

21255241363346 is a deficient number, since it is larger than the sum of its proper divisors (10627620681676).

21255241363346 is a wasteful number, since it uses less digits than its factorization.

21255241363346 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10627620681675.

The product of its digits is 3110400, while the sum is 47.

The spelling of 21255241363346 in words is "twenty-one trillion, two hundred fifty-five billion, two hundred forty-one million, three hundred sixty-three thousand, three hundred forty-six".