20211555554345 has 16 divisors (see below), whose sum is σ = 24314172382080. Its totient is φ = 16129048320000.

The previous prime is 20211555554233. The next prime is 20211555554363. The reversal of 20211555554345 is 54345555511202.

It is not a de Polignac number, because 20211555554345 - 2²⁶ = 20211488445481 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20211555554345.

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, 20791145 + ... + 21741545.

It is an arithmetic number, because the mean of its divisors is an integer number (1519635773880).

Almost surely, 2^{20211555554345} is an apocalyptic number.

It is an amenable number.

20211555554345 is a deficient number, since it is larger than the sum of its proper divisors (4102616827735).

20211555554345 is a wasteful number, since it uses less digits than its factorization.

20211555554345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 960976.

The product of its (nonzero) digits is 3000000, while the sum is 47.

The spelling of 20211555554345 in words is "twenty trillion, two hundred eleven billion, five hundred fifty-five million, five hundred fifty-four thousand, three hundred forty-five".