2101021157 has 2 divisors, whose sum is σ = 2101021158. Its totient is φ = 2101021156.

The previous prime is 2101021133. The next prime is 2101021171. The reversal of 2101021157 is 7511201012.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1827648001 + 273373156 = 42751^2 + 16534^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2101021157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2101021127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1050510578 + 1050510579.

It is an arithmetic number, because the mean of its divisors is an integer number (1050510579).

Almost surely, 2^2101021157 is an apocalyptic number.

It is an amenable number.

2101021157 is a deficient number, since it is larger than the sum of its proper divisors (1).

2101021157 is an equidigital number, since it uses as much as digits as its factorization.

2101021157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 140, while the sum is 20.

The square root of 2101021157 is about 45836.8973317348. The cubic root of 2101021157 is about 1280.7866983966.

Adding to 2101021157 its reverse (7511201012), we get a palindrome (9612222169).

The spelling of 2101021157 in words is "two billion, one hundred one million, twenty-one thousand, one hundred fifty-seven".