2171211551 has 2 divisors, whose sum is σ = 2171211552. Its totient is φ = 2171211550.

The previous prime is 2171211533. The next prime is 2171211557. The reversal of 2171211551 is 1551121712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2171211551 - 2⁶ = 2171211487 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 2171211551.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2171211557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1085605775 + 1085605776.

It is an arithmetic number, because the mean of its divisors is an integer number (1085605776).

Almost surely, 2^2171211551 is an apocalyptic number.

2171211551 is a deficient number, since it is larger than the sum of its proper divisors (1).

2171211551 is an equidigital number, since it uses as much as digits as its factorization.

2171211551 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 700, while the sum is 26.

The square root of 2171211551 is about 46596.2611268329. The cubic root of 2171211551 is about 1294.8934883553.

The spelling of 2171211551 in words is "two billion, one hundred seventy-one million, two hundred eleven thousand, five hundred fifty-one".