21701365477031 has 2 divisors, whose sum is σ = 21701365477032. Its totient is φ = 21701365477030.

The previous prime is 21701365476911. The next prime is 21701365477039. The reversal of 21701365477031 is 13077456310712.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21701365477031 - 2⁴² = 17303318965927 is a prime.

It is a super-2 number, since 2×21701365477031² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21701365477039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10850682738515 + 10850682738516.

It is an arithmetic number, because the mean of its divisors is an integer number (10850682738516).

Almost surely, 2^{21701365477031} is an apocalyptic number.

21701365477031 is a deficient number, since it is larger than the sum of its proper divisors (1).

21701365477031 is an equidigital number, since it uses as much as digits as its factorization.

21701365477031 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 740880, while the sum is 47.

The spelling of 21701365477031 in words is "twenty-one trillion, seven hundred one billion, three hundred sixty-five million, four hundred seventy-seven thousand, thirty-one".