211521420341 has 16 divisors (see below), whose sum is σ = 263759683968. Its totient is φ = 164793969600.

The previous prime is 211521420323. The next prime is 211521420413. The reversal of 211521420341 is 143024125112.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211521420341 is a prime.

It is a super-2 number, since 2×211521420341² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211521420341.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211521420541) 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, 230891 + ... + 690183.

It is an arithmetic number, because the mean of its divisors is an integer number (16484980248).

Almost surely, 2^211521420341 is an apocalyptic number.

It is an amenable number.

211521420341 is a deficient number, since it is larger than the sum of its proper divisors (52238263627).

211521420341 is a wasteful number, since it uses less digits than its factorization.

211521420341 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 465292.

The product of its (nonzero) digits is 1920, while the sum is 26.

Adding to 211521420341 its reverse (143024125112), we get a palindrome (354545545453).

The spelling of 211521420341 in words is "two hundred eleven billion, five hundred twenty-one million, four hundred twenty thousand, three hundred forty-one".