211263540 has 24 divisors (see below), whose sum is σ = 591538080. Its totient is φ = 56336928.

The previous prime is 211263523. The next prime is 211263541. The reversal of 211263540 is 45362112.

It is a self number, because there is not a number n which added to its sum of digits gives 211263540.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211263541) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1760470 + ... + 1760589.

It is an arithmetic number, because the mean of its divisors is an integer number (24647420).

Almost surely, 2^211263540 is an apocalyptic number.

211263540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211263540 is an abundant number, since it is smaller than the sum of its proper divisors (380274540).

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

211263540 is a wasteful number, since it uses less digits than its factorization.

211263540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3521071 (or 3521069 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 211263540 is about 14534.9076364454. The cubic root of 211263540 is about 595.5819365980.

The spelling of 211263540 in words is "two hundred eleven million, two hundred sixty-three thousand, five hundred forty".