2121630246261 has 6 divisors (see below), whose sum is σ = 3064577022390. Its totient is φ = 1414420164168.

The previous prime is 2121630246251. The next prime is 2121630246283. The reversal of 2121630246261 is 1626420361212.

2121630246261 is a `hidden beast` number, since 2 + 1 + 2 + 1 + 6 + 3 + 0 + 24 + 626 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1230588643761 + 891041602500 = 1109319^2 + 943950^2 .

It is not a de Polignac number, because 2121630246261 - 2¹¹ = 2121630244213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2121630246251) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 117868347006 + ... + 117868347023.

It is an arithmetic number, because the mean of its divisors is an integer number (510762837065).

Almost surely, 2^{2121630246261} is an apocalyptic number.

It is an amenable number.

2121630246261 is a deficient number, since it is larger than the sum of its proper divisors (942946776129).

2121630246261 is a wasteful number, since it uses less digits than its factorization.

2121630246261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 235736694035 (or 235736694032 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The spelling of 2121630246261 in words is "two trillion, one hundred twenty-one billion, six hundred thirty million, two hundred forty-six thousand, two hundred sixty-one".