21355673561452 has 6 divisors (see below), whose sum is σ = 37372428732548. Its totient is φ = 10677836780724.

The previous prime is 21355673561407. The next prime is 21355673561479. The reversal of 21355673561452 is 25416537655312.

It is a junction number, because it is equal to n+sod(n) for n = 21355673561393 and 21355673561402.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2669459195178 + ... + 2669459195185.

Almost surely, 2^{21355673561452} is an apocalyptic number.

It is an amenable number.

21355673561452 is a deficient number, since it is larger than the sum of its proper divisors (16016755171096).

21355673561452 is a wasteful number, since it uses less digits than its factorization.

21355673561452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5338918390367 (or 5338918390365 counting only the distinct ones).

The product of its digits is 22680000, while the sum is 55.

The spelling of 21355673561452 in words is "twenty-one trillion, three hundred fifty-five billion, six hundred seventy-three million, five hundred sixty-one thousand, four hundred fifty-two".