211240661993 has 8 divisors (see below), whose sum is σ = 218446375680. Its totient is φ = 204059417040.

The previous prime is 211240661867. The next prime is 211240661999. The reversal of 211240661993 is 399166042112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211240661993 - 2¹⁸ = 211240399849 is a prime.

It is a super-3 number, since 3×211240661993³ (a number of 35 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (211240661999) 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, 6099623 + ... + 6134156.

It is an arithmetic number, because the mean of its divisors is an integer number (27305796960).

Almost surely, 2^211240661993 is an apocalyptic number.

It is an amenable number.

211240661993 is a deficient number, since it is larger than the sum of its proper divisors (7205713687).

211240661993 is a wasteful number, since it uses less digits than its factorization.

211240661993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12234367.

The product of its (nonzero) digits is 139968, while the sum is 44.

The spelling of 211240661993 in words is "two hundred eleven billion, two hundred forty million, six hundred sixty-one thousand, nine hundred ninety-three".