211551605061 has 8 divisors (see below), whose sum is σ = 282153960000. Its totient is φ = 140991826752.

The previous prime is 211551605021. The next prime is 211551605129. The reversal of 211551605061 is 160506155112.

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

It is not a de Polignac number, because 211551605061 - 2¹³ = 211551596869 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211551605021) 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, 10632561 + ... + 10652438.

It is an arithmetic number, because the mean of its divisors is an integer number (35269245000).

Almost surely, 2^211551605061 is an apocalyptic number.

It is an amenable number.

211551605061 is a deficient number, since it is larger than the sum of its proper divisors (70602354939).

211551605061 is a wasteful number, since it uses less digits than its factorization.

211551605061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21288315.

The product of its (nonzero) digits is 9000, while the sum is 33.

The spelling of 211551605061 in words is "two hundred eleven billion, five hundred fifty-one million, six hundred five thousand, sixty-one".