20213051077 has 2 divisors, whose sum is σ = 20213051078. Its totient is φ = 20213051076.

The previous prime is 20213051071. The next prime is 20213051081. The reversal of 20213051077 is 77015031202.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17183539396 + 3029511681 = 131086^2 + 55041^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20213051077 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20213051071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10106525538 + 10106525539.

It is an arithmetic number, because the mean of its divisors is an integer number (10106525539).

Almost surely, 2^20213051077 is an apocalyptic number.

It is an amenable number.

20213051077 is a deficient number, since it is larger than the sum of its proper divisors (1).

20213051077 is an equidigital number, since it uses as much as digits as its factorization.

20213051077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2940, while the sum is 28.

Adding to 20213051077 its reverse (77015031202), we get a palindrome (97228082279).

The spelling of 20213051077 in words is "twenty billion, two hundred thirteen million, fifty-one thousand, seventy-seven".