21435360641655 has 32 divisors (see below), whose sum is σ = 35432744675328. Its totient is φ = 11054091177600.

The previous prime is 21435360641647. The next prime is 21435360641677. The reversal of 21435360641655 is 55614606353412.

It is a happy number.

It is not a de Polignac number, because 21435360641655 - 2³ = 21435360641647 is a prime.

It is a super-2 number, since 2×21435360641655² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21435360641598 and 21435360641607.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18865716 + ... + 19969625.

It is an arithmetic number, because the mean of its divisors is an integer number (1107273271104).

Almost surely, 2^{21435360641655} is an apocalyptic number.

21435360641655 is a deficient number, since it is larger than the sum of its proper divisors (13997384033673).

21435360641655 is a wasteful number, since it uses less digits than its factorization.

21435360641655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38836567.

The product of its (nonzero) digits is 7776000, while the sum is 51.

The spelling of 21435360641655 in words is "twenty-one trillion, four hundred thirty-five billion, three hundred sixty million, six hundred forty-one thousand, six hundred fifty-five".