20122011397 has 2 divisors, whose sum is σ = 20122011398. Its totient is φ = 20122011396.

The previous prime is 20122011341. The next prime is 20122011409. The reversal of 20122011397 is 79311022102.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20118301921 + 3709476 = 141839^2 + 1926^2 .

It is a cyclic number.

It is not a de Polignac number, because 20122011397 - 2²⁷ = 19987793669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20122011797) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10061005698 + 10061005699.

It is an arithmetic number, because the mean of its divisors is an integer number (10061005699).

Almost surely, 2^20122011397 is an apocalyptic number.

It is an amenable number.

20122011397 is a deficient number, since it is larger than the sum of its proper divisors (1).

20122011397 is an equidigital number, since it uses as much as digits as its factorization.

20122011397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1512, while the sum is 28.

Adding to 20122011397 its reverse (79311022102), we get a palindrome (99433033499).

The spelling of 20122011397 in words is "twenty billion, one hundred twenty-two million, eleven thousand, three hundred ninety-seven".