211542420 has 48 divisors (see below), whose sum is σ = 594474048. Its totient is φ = 56206080.

The previous prime is 211542403. The next prime is 211542427. The reversal of 211542420 is 24245112.

211542420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211542427) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10587 + ... + 23133.

It is an arithmetic number, because the mean of its divisors is an integer number (12384876).

Almost surely, 2^211542420 is an apocalyptic number.

211542420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211542420 is an abundant number, since it is smaller than the sum of its proper divisors (382931628).

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

211542420 is a wasteful number, since it uses less digits than its factorization.

211542420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12840 (or 12838 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 211542420 is about 14544.4979287702. The cubic root of 211542420 is about 595.8438888160.

Adding to 211542420 its reverse (24245112), we get a palindrome (235787532).

The spelling of 211542420 in words is "two hundred eleven million, five hundred forty-two thousand, four hundred twenty".