21963763147481 has 2 divisors, whose sum is σ = 21963763147482. Its totient is φ = 21963763147480.

The previous prime is 21963763147471. The next prime is 21963763147489. The reversal of 21963763147481 is 18474136736912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21798244361881 + 165518785600 = 4668859^2 + 406840^2 .

It is a cyclic number.

It is not a de Polignac number, because 21963763147481 - 2²² = 21963758953177 is a prime.

It is a super-2 number, since 2×21963763147481² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21963763147489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10981881573740 + 10981881573741.

It is an arithmetic number, because the mean of its divisors is an integer number (10981881573741).

Almost surely, 2^{21963763147481} is an apocalyptic number.

It is an amenable number.

21963763147481 is a deficient number, since it is larger than the sum of its proper divisors (1).

21963763147481 is an equidigital number, since it uses as much as digits as its factorization.

21963763147481 is an evil number, because the sum of its binary digits is even.

The product of its digits is 36578304, while the sum is 62.

The spelling of 21963763147481 in words is "twenty-one trillion, nine hundred sixty-three billion, seven hundred sixty-three million, one hundred forty-seven thousand, four hundred eighty-one".