21434052077 has 2 divisors, whose sum is σ = 21434052078. Its totient is φ = 21434052076.

The previous prime is 21434052049. The next prime is 21434052097. The reversal of 21434052077 is 77025043412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14934306436 + 6499745641 = 122206^2 + 80621^2 .

It is a cyclic number.

It is not a de Polignac number, because 21434052077 - 2¹² = 21434047981 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21434052097) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10717026038 + 10717026039.

It is an arithmetic number, because the mean of its divisors is an integer number (10717026039).

Almost surely, 2^21434052077 is an apocalyptic number.

It is an amenable number.

21434052077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21434052077 is an equidigital number, since it uses as much as digits as its factorization.

21434052077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 47040, while the sum is 35.

Adding to 21434052077 its reverse (77025043412), we get a palindrome (98459095489).

The spelling of 21434052077 in words is "twenty-one billion, four hundred thirty-four million, fifty-two thousand, seventy-seven".