21421155076686 has 24 divisors (see below), whose sum is σ = 46412589767544. Its totient is φ = 7140371625360.

The previous prime is 21421155076637. The next prime is 21421155076709. The reversal of 21421155076686 is 68667055112412.

21421155076686 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 1 + 1 + 550 + 7 + 6 + 6 + 86 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 15128296 + ... + 16483556.

It is an arithmetic number, because the mean of its divisors is an integer number (1933857906981).

Almost surely, 2^{21421155076686} is an apocalyptic number.

21421155076686 is an abundant number, since it is smaller than the sum of its proper divisors (24991434690858).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21421155076686 is a wasteful number, since it uses less digits than its factorization.

21421155076686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2233376 (or 2233373 counting only the distinct ones).

The product of its (nonzero) digits is 4838400, while the sum is 54.

The spelling of 21421155076686 in words is "twenty-one trillion, four hundred twenty-one billion, one hundred fifty-five million, seventy-six thousand, six hundred eighty-six".