2012211620661 has 16 divisors (see below), whose sum is σ = 3027779242560. Its totient is φ = 1177469704320.

The previous prime is 2012211620659. The next prime is 2012211620717. The reversal of 2012211620661 is 1660261122102.

It is not a de Polignac number, because 2012211620661 - 2¹ = 2012211620659 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2012211622661) 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, 1051311280 + ... + 1051313193.

It is an arithmetic number, because the mean of its divisors is an integer number (189236202660).

Almost surely, 2^{2012211620661} is an apocalyptic number.

It is an amenable number.

2012211620661 is a deficient number, since it is larger than the sum of its proper divisors (1015567621899).

2012211620661 is a wasteful number, since it uses less digits than its factorization.

2012211620661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102624516.

The product of its (nonzero) digits is 3456, while the sum is 30.

Adding to 2012211620661 its reverse (1660261122102), we get a palindrome (3672472742763).

The spelling of 2012211620661 in words is "two trillion, twelve billion, two hundred eleven million, six hundred twenty thousand, six hundred sixty-one".