2120221601651 has 2 divisors, whose sum is σ = 2120221601652. Its totient is φ = 2120221601650.

The previous prime is 2120221601581. The next prime is 2120221601653. The reversal of 2120221601651 is 1561061220212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2120221601651 - 2¹⁸ = 2120221339507 is a prime.

Together with 2120221601653, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (2120221601653) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1060110800825 + 1060110800826.

It is an arithmetic number, because the mean of its divisors is an integer number (1060110800826).

Almost surely, 2^{2120221601651} is an apocalyptic number.

2120221601651 is a deficient number, since it is larger than the sum of its proper divisors (1).

2120221601651 is an equidigital number, since it uses as much as digits as its factorization.

2120221601651 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2880, while the sum is 29.

Adding to 2120221601651 its reverse (1561061220212), we get a palindrome (3681282821863).

The spelling of 2120221601651 in words is "two trillion, one hundred twenty billion, two hundred twenty-one million, six hundred one thousand, six hundred fifty-one".