20213310157 has 2 divisors, whose sum is σ = 20213310158. Its totient is φ = 20213310156.

The previous prime is 20213310121. The next prime is 20213310167. The reversal of 20213310157 is 75101331202.

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., 18219330441 + 1993979716 = 134979^2 + 44654^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20213310157 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213310167) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106655078 + 10106655079.

It is an arithmetic number, because the mean of its divisors is an integer number (10106655079).

Almost surely, 2^20213310157 is an apocalyptic number.

It is an amenable number.

20213310157 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213310157 is an equidigital number, since it uses as much as digits as its factorization.

20213310157 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1260, while the sum is 25.

Adding to 20213310157 its reverse (75101331202), we get a palindrome (95314641359).

The spelling of 20213310157 in words is "twenty billion, two hundred thirteen million, three hundred ten thousand, one hundred fifty-seven".