21403413197 has 2 divisors, whose sum is σ = 21403413198. Its totient is φ = 21403413196.

The previous prime is 21403413191. The next prime is 21403413263. The reversal of 21403413197 is 79131430412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17452787881 + 3950625316 = 132109^2 + 62854^2 .

It is a cyclic number.

It is not a de Polignac number, because 21403413197 - 2⁴ = 21403413181 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21403413191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10701706598 + 10701706599.

It is an arithmetic number, because the mean of its divisors is an integer number (10701706599).

Almost surely, 2^21403413197 is an apocalyptic number.

It is an amenable number.

21403413197 is a deficient number, since it is larger than the sum of its proper divisors (1).

21403413197 is an equidigital number, since it uses as much as digits as its factorization.

21403413197 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 18144, while the sum is 35.

The spelling of 21403413197 in words is "twenty-one billion, four hundred three million, four hundred thirteen thousand, one hundred ninety-seven".