2051161221213 has 16 divisors (see below), whose sum is σ = 3272507931840. Its totient is φ = 1262253058992.

The previous prime is 2051161221211. The next prime is 2051161221223. The reversal of 2051161221213 is 3121221611502.

It is a happy number.

2051161221213 is a `hidden beast` number, since 2 + 0 + 5 + 1 + 1 + 612 + 21 + 21 + 3 = 666.

It is not a de Polignac number, because 2051161221213 - 2¹ = 2051161221211 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051161221211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2921881731 + ... + 2921882432.

It is an arithmetic number, because the mean of its divisors is an integer number (204531745740).

Almost surely, 2^{2051161221213} is an apocalyptic number.

It is an amenable number.

2051161221213 is a deficient number, since it is larger than the sum of its proper divisors (1221346710627).

2051161221213 is a wasteful number, since it uses less digits than its factorization.

2051161221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5843764185 (or 5843764179 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 27.

Adding to 2051161221213 its reverse (3121221611502), we get a palindrome (5172382832715).

The spelling of 2051161221213 in words is "two trillion, fifty-one billion, one hundred sixty-one million, two hundred twenty-one thousand, two hundred thirteen".