21222156205345 has 16 divisors (see below), whose sum is σ = 26807715060480. Its totient is φ = 16083691948800.

The previous prime is 21222156205339. The next prime is 21222156205451. The reversal of 21222156205345 is 54350265122212.

It is a de Polignac number, because none of the positive numbers 2^k-21222156205345 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21222156205298 and 21222156205307.

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, 42025 + ... + 6515065.

It is an arithmetic number, because the mean of its divisors is an integer number (1675482191280).

Almost surely, 2^{21222156205345} is an apocalyptic number.

It is an amenable number.

21222156205345 is a deficient number, since it is larger than the sum of its proper divisors (5585558855135).

21222156205345 is a wasteful number, since it uses less digits than its factorization.

21222156205345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6507576.

The product of its (nonzero) digits is 288000, while the sum is 40.

The spelling of 21222156205345 in words is "twenty-one trillion, two hundred twenty-two billion, one hundred fifty-six million, two hundred five thousand, three hundred forty-five".