2051154221 has 4 divisors (see below), whose sum is σ = 2059957692. Its totient is φ = 2042350752.

The previous prime is 2051154211. The next prime is 2051154233. The reversal of 2051154221 is 1224511502.

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 621255625 + 1429898596 = 24925^2 + 37814^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2051154221 is a prime.

It is a super-2 number, since 2×2051154221² = 8414467276652233682, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2051154211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4401386 + ... + 4401851.

It is an arithmetic number, because the mean of its divisors is an integer number (514989423).

Almost surely, 2^2051154221 is an apocalyptic number.

It is an amenable number.

2051154221 is a deficient number, since it is larger than the sum of its proper divisors (8803471).

2051154221 is an equidigital number, since it uses as much as digits as its factorization.

2051154221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8803470.

The product of its (nonzero) digits is 800, while the sum is 23.

The square root of 2051154221 is about 45289.6701356943. The cubic root of 2051154221 is about 1270.5724620717.

Adding to 2051154221 its reverse (1224511502), we get a palindrome (3275665723).

The spelling of 2051154221 in words is "two billion, fifty-one million, one hundred fifty-four thousand, two hundred twenty-one".