211240661988 has 24 divisors (see below), whose sum is σ = 504916705440. Its totient is φ = 68696150080.

The previous prime is 211240661867. The next prime is 211240661999. The reversal of 211240661988 is 889166042112.

It is a super-3 number, since 3×211240661988³ (a number of 35 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214674978 + ... + 214675961.

It is an arithmetic number, because the mean of its divisors is an integer number (21038196060).

Almost surely, 2^211240661988 is an apocalyptic number.

It is an amenable number.

211240661988 is an abundant number, since it is smaller than the sum of its proper divisors (293676043452).

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

211240661988 is a wasteful number, since it uses less digits than its factorization.

211240661988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429350987 (or 429350985 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 48.

The spelling of 211240661988 in words is "two hundred eleven billion, two hundred forty million, six hundred sixty-one thousand, nine hundred eighty-eight".