211420231440 has 120 divisors (see below), whose sum is σ = 720401433024. Its totient is φ = 51253382400.

The previous prime is 211420231423. The next prime is 211420231447. The reversal of 211420231440 is 44132024112.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 211420231440.

It is not an unprimeable number, because it can be changed into a prime (211420231447) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3611116 + ... + 3669195.

Almost surely, 2^211420231440 is an apocalyptic number.

211420231440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211420231440 is an abundant number, since it is smaller than the sum of its proper divisors (508981201584).

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

211420231440 is a wasteful number, since it uses less digits than its factorization.

211420231440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7280349 (or 7280332 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 211420231440 its reverse (44132024112), we get a palindrome (255552255552).

The spelling of 211420231440 in words is "two hundred eleven billion, four hundred twenty million, two hundred thirty-one thousand, four hundred forty".