21150023046469 has 2 divisors, whose sum is σ = 21150023046470. Its totient is φ = 21150023046468.

The previous prime is 21150023046409. The next prime is 21150023046479. The reversal of 21150023046469 is 96464032005112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19590803822500 + 1559219223969 = 4426150^2 + 1248687^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21150023046469 is a prime.

It is a super-2 number, since 2×21150023046469² (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 (21150023046409) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10575011523234 + 10575011523235.

It is an arithmetic number, because the mean of its divisors is an integer number (10575011523235).

Almost surely, 2^{21150023046469} is an apocalyptic number.

It is an amenable number.

21150023046469 is a deficient number, since it is larger than the sum of its proper divisors (1).

21150023046469 is an equidigital number, since it uses as much as digits as its factorization.

21150023046469 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 21150023046469 in words is "twenty-one trillion, one hundred fifty billion, twenty-three million, forty-six thousand, four hundred sixty-nine".