211204020420 has 72 divisors (see below), whose sum is σ = 640695695640. Its totient is φ = 56317248000.

The previous prime is 211204020389. The next prime is 211204020497. The reversal of 211204020420 is 24020402112.

211204020420 is a `hidden beast` number, since 21 + 1 + 204 + 0 + 20 + 420 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 84405356676 + 126798663744 = 290526^2 + 356088^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 211204020393 and 211204020402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3480096 + ... + 3540264.

Almost surely, 2^211204020420 is an apocalyptic number.

211204020420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211204020420 is an abundant number, since it is smaller than the sum of its proper divisors (429491675220).

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

211204020420 is a wasteful number, since it uses less digits than its factorization.

211204020420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79685 (or 79680 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

Adding to 211204020420 its reverse (24020402112), we get a palindrome (235224422532).

The spelling of 211204020420 in words is "two hundred eleven billion, two hundred four million, twenty thousand, four hundred twenty".