211910192020 has 12 divisors (see below), whose sum is σ = 445011403284. Its totient is φ = 84764076800.

The previous prime is 211910192009. The next prime is 211910192023. The reversal of 211910192020 is 20291019112.

It can be written as a sum of positive squares in 2 ways, for example, as 43903659024 + 168006532996 = 209532^2 + 409886^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 211910192020.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211910192023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5297754781 + ... + 5297754820.

It is an arithmetic number, because the mean of its divisors is an integer number (37084283607).

Almost surely, 2^211910192020 is an apocalyptic number.

211910192020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211910192020 is an abundant number, since it is smaller than the sum of its proper divisors (233101211264).

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

211910192020 is a wasteful number, since it uses less digits than its factorization.

211910192020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10595509610 (or 10595509608 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 28.

The spelling of 211910192020 in words is "two hundred eleven billion, nine hundred ten million, one hundred ninety-two thousand, twenty".