2281821663981 has 32 divisors (see below), whose sum is σ = 3155158056960. Its totient is φ = 1465311355200.

The previous prime is 2281821663899. The next prime is 2281821663997. The reversal of 2281821663981 is 1893661281822.

It is not a de Polignac number, because 2281821663981 - 2⁹ = 2281821663469 is a prime.

It is a super-2 number, since 2×2281821663981² (a number of 26 digits) contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2281821663881) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 50944126 + ... + 50988896.

It is an arithmetic number, because the mean of its divisors is an integer number (98598689280).

Almost surely, 2^{2281821663981} is an apocalyptic number.

It is an amenable number.

2281821663981 is a deficient number, since it is larger than the sum of its proper divisors (873336392979).

2281821663981 is a wasteful number, since it uses less digits than its factorization.

2281821663981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47337.

The product of its digits is 3981312, while the sum is 57.

The spelling of 2281821663981 in words is "two trillion, two hundred eighty-one billion, eight hundred twenty-one million, six hundred sixty-three thousand, nine hundred eighty-one".