20511445355211 has 8 divisors (see below), whose sum is σ = 27402323855760. Its totient is φ = 13647431879072.

The previous prime is 20511445355207. The next prime is 20511445355213. The reversal of 20511445355211 is 11255354411502.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 20511445355211 - 2² = 20511445355207 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20511445355211.

It is not an unprimeable number, because it can be changed into a prime (20511445355213) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6716254320 + ... + 6716257373.

It is an arithmetic number, because the mean of its divisors is an integer number (3425290481970).

Almost surely, 2^{20511445355211} is an apocalyptic number.

20511445355211 is a deficient number, since it is larger than the sum of its proper divisors (6890878500549).

20511445355211 is a wasteful number, since it uses less digits than its factorization.

20511445355211 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13432512205.

The product of its (nonzero) digits is 120000, while the sum is 39.

Adding to 20511445355211 its reverse (11255354411502), we get a palindrome (31766799766713).

The spelling of 20511445355211 in words is "twenty trillion, five hundred eleven billion, four hundred forty-five million, three hundred fifty-five thousand, two hundred eleven".