21278313714445 has 16 divisors (see below), whose sum is σ = 26428317138432. Its totient is φ = 16429368185280.

The previous prime is 21278313714439. The next prime is 21278313714461. The reversal of 21278313714445 is 54441731387212.

It is not a de Polignac number, because 21278313714445 - 2¹⁹ = 21278313190157 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21278313714392 and 21278313714401.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 183962887 + ... + 184078516.

It is an arithmetic number, because the mean of its divisors is an integer number (1651769821152).

Almost surely, 2^{21278313714445} is an apocalyptic number.

It is an amenable number.

21278313714445 is a deficient number, since it is larger than the sum of its proper divisors (5150003423987).

21278313714445 is a wasteful number, since it uses less digits than its factorization.

21278313714445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 368041812.

The product of its digits is 4515840, while the sum is 52.

The spelling of 21278313714445 in words is "twenty-one trillion, two hundred seventy-eight billion, three hundred thirteen million, seven hundred fourteen thousand, four hundred forty-five".