211220104578 has 128 divisors (see below), whose sum is σ = 534761740800. Its totient is φ = 54223454208.

The previous prime is 211220104573. The next prime is 211220104631. The reversal of 211220104578 is 875401022112.

It is a super-2 number, since 2×211220104578² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211220104573) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1785526 + ... + 1900142.

It is an arithmetic number, because the mean of its divisors is an integer number (4177826100).

Almost surely, 2^211220104578 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211220104578, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267380870400).

211220104578 is an abundant number, since it is smaller than the sum of its proper divisors (323541636222).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211220104578 is a wasteful number, since it uses less digits than its factorization.

211220104578 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114764.

The product of its (nonzero) digits is 8960, while the sum is 33.

The spelling of 211220104578 in words is "two hundred eleven billion, two hundred twenty million, one hundred four thousand, five hundred seventy-eight".