21469502077 has 2 divisors, whose sum is σ = 21469502078. Its totient is φ = 21469502076.

The previous prime is 21469502069. The next prime is 21469502101. The reversal of 21469502077 is 77020596412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17052703396 + 4416798681 = 130586^2 + 66459^2 .

It is a cyclic number.

It is not a de Polignac number, because 21469502077 - 2³ = 21469502069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21469502057) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10734751038 + 10734751039.

It is an arithmetic number, because the mean of its divisors is an integer number (10734751039).

Almost surely, 2^21469502077 is an apocalyptic number.

It is an amenable number.

21469502077 is a deficient number, since it is larger than the sum of its proper divisors (1).

21469502077 is an equidigital number, since it uses as much as digits as its factorization.

21469502077 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 43.

The spelling of 21469502077 in words is "twenty-one billion, four hundred sixty-nine million, five hundred two thousand, seventy-seven".