21275405460668 has 24 divisors (see below), whose sum is σ = 37560307053360. Its totient is φ = 10544260700160.

The previous prime is 21275405460557. The next prime is 21275405460691. The reversal of 21275405460668 is 86606450457212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46213253 + ... + 46671356.

It is an arithmetic number, because the mean of its divisors is an integer number (1565012793890).

Almost surely, 2^{21275405460668} is an apocalyptic number.

It is an amenable number.

21275405460668 is a deficient number, since it is larger than the sum of its proper divisors (16284901592692).

21275405460668 is a wasteful number, since it uses less digits than its factorization.

21275405460668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92885117 (or 92885115 counting only the distinct ones).

The product of its (nonzero) digits is 19353600, while the sum is 56.

The spelling of 21275405460668 in words is "twenty-one trillion, two hundred seventy-five billion, four hundred five million, four hundred sixty thousand, six hundred sixty-eight".