2211563121461 has 4 divisors (see below), whose sum is σ = 2223021997932. Its totient is φ = 2200104244992.

The previous prime is 2211563121431. The next prime is 2211563121463. The reversal of 2211563121461 is 1641213651122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1242901671025 + 968661450436 = 1114855^2 + 984206^2 .

It is a cyclic number.

It is not a de Polignac number, because 2211563121461 - 2¹⁴ = 2211563105077 is a prime.

It is a super-2 number, since 2×2211563121461² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2211563121463) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5729437946 + ... + 5729438331.

It is an arithmetic number, because the mean of its divisors is an integer number (555755499483).

Almost surely, 2^{2211563121461} is an apocalyptic number.

It is an amenable number.

2211563121461 is a deficient number, since it is larger than the sum of its proper divisors (11458876471).

2211563121461 is a wasteful number, since it uses less digits than its factorization.

2211563121461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11458876470.

The product of its digits is 17280, while the sum is 35.

Adding to 2211563121461 its reverse (1641213651122), we get a palindrome (3852776772583).

The spelling of 2211563121461 in words is "two trillion, two hundred eleven billion, five hundred sixty-three million, one hundred twenty-one thousand, four hundred sixty-one".