21472753620449 has 2 divisors, whose sum is σ = 21472753620450. Its totient is φ = 21472753620448.

The previous prime is 21472753620401. The next prime is 21472753620497. The reversal of 21472753620449 is 94402635727412.

It is a happy number.

It is a balanced prime because it is at equal distance from previous prime (21472753620401) and next prime (21472753620497).

It can be written as a sum of positive squares in only one way, i.e., 20773832540224 + 698921080225 = 4557832^2 + 836015^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21472753620449 is a prime.

It is a super-2 number, since 2×21472753620449² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21472753620394 and 21472753620403.

It is not a weakly prime, because it can be changed into another prime (21472753620949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10736376810224 + 10736376810225.

It is an arithmetic number, because the mean of its divisors is an integer number (10736376810225).

Almost surely, 2^{21472753620449} is an apocalyptic number.

It is an amenable number.

21472753620449 is a deficient number, since it is larger than the sum of its proper divisors (1).

21472753620449 is an equidigital number, since it uses as much as digits as its factorization.

21472753620449 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20321280, while the sum is 56.

The spelling of 21472753620449 in words is "twenty-one trillion, four hundred seventy-two billion, seven hundred fifty-three million, six hundred twenty thousand, four hundred forty-nine".