211242404420 has 24 divisors (see below), whose sum is σ = 443687787648. Its totient is φ = 84481964000.

The previous prime is 211242404407. The next prime is 211242404431. The reversal of 211242404420 is 24404242112.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 211242404420.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 821516 + ... + 1047555.

It is an arithmetic number, because the mean of its divisors is an integer number (18486991152).

Almost surely, 2^211242404420 is an apocalyptic number.

211242404420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211242404420 is an abundant number, since it is smaller than the sum of its proper divisors (232445383228).

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

211242404420 is a wasteful number, since it uses less digits than its factorization.

211242404420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1874731 (or 1874729 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 26.

Adding to 211242404420 its reverse (24404242112), we get a palindrome (235646646532).

The spelling of 211242404420 in words is "two hundred eleven billion, two hundred forty-two million, four hundred four thousand, four hundred twenty".