20211423251 has 2 divisors, whose sum is σ = 20211423252. Its totient is φ = 20211423250.

The previous prime is 20211423217. The next prime is 20211423311. The reversal of 20211423251 is 15232411202.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 20211423251 - 2²² = 20207228947 is a prime.

It is not a weakly prime, because it can be changed into another prime (20211423751) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105711625 + 10105711626.

It is an arithmetic number, because the mean of its divisors is an integer number (10105711626).

Almost surely, 2^20211423251 is an apocalyptic number.

20211423251 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211423251 is an equidigital number, since it uses as much as digits as its factorization.

20211423251 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 960, while the sum is 23.

Adding to 20211423251 its reverse (15232411202), we get a palindrome (35443834453).

The spelling of 20211423251 in words is "twenty billion, two hundred eleven million, four hundred twenty-three thousand, two hundred fifty-one".