211612520406 has 96 divisors (see below), whose sum is σ = 540854818560. Its totient is φ = 53909190144.

The previous prime is 211612520351. The next prime is 211612520443. The reversal of 211612520406 is 604025216112.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 228165 + ... + 689408.

It is an arithmetic number, because the mean of its divisors is an integer number (5633904360).

Almost surely, 2^211612520406 is an apocalyptic number.

211612520406 is an abundant number, since it is smaller than the sum of its proper divisors (329242298154).

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

211612520406 is a wasteful number, since it uses less digits than its factorization.

211612520406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 917638 (or 917621 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 30.

Adding to 211612520406 its reverse (604025216112), we get a palindrome (815637736518).

The spelling of 211612520406 in words is "two hundred eleven billion, six hundred twelve million, five hundred twenty thousand, four hundred six".