21030022157 has 2 divisors, whose sum is σ = 21030022158. Its totient is φ = 21030022156.

The previous prime is 21030022093. The next prime is 21030022213. The reversal of 21030022157 is 75122003012.

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., 20340749641 + 689272516 = 142621^2 + 26254^2 .

It is a cyclic number.

It is not a de Polignac number, because 21030022157 - 2⁶ = 21030022093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21030022357) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10515011078 + 10515011079.

It is an arithmetic number, because the mean of its divisors is an integer number (10515011079).

Almost surely, 2^21030022157 is an apocalyptic number.

It is an amenable number.

21030022157 is a deficient number, since it is larger than the sum of its proper divisors (1).

21030022157 is an equidigital number, since it uses as much as digits as its factorization.

21030022157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 840, while the sum is 23.

Adding to 21030022157 its reverse (75122003012), we get a palindrome (96152025169).

The spelling of 21030022157 in words is "twenty-one billion, thirty million, twenty-two thousand, one hundred fifty-seven".