21467381991264 has 144 divisors (see below), whose sum is σ = 66601081506960. Its totient is φ = 6504934394880.

The previous prime is 21467381991119. The next prime is 21467381991271. The reversal of 21467381991264 is 46219918376412.

21467381991264 is a `hidden beast` number, since 2 + 1 + 46 + 7 + 381 + 99 + 126 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 65696574 + ... + 66022530.

It is an arithmetic number, because the mean of its divisors is an integer number (462507510465).

Almost surely, 2^{21467381991264} is an apocalyptic number.

21467381991264 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21467381991264 is an abundant number, since it is smaller than the sum of its proper divisors (45133699515696).

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

21467381991264 is a wasteful number, since it uses less digits than its factorization.

21467381991264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346773 (or 346762 counting only the distinct ones).

The product of its digits is 31352832, while the sum is 63.

The spelling of 21467381991264 in words is "twenty-one trillion, four hundred sixty-seven billion, three hundred eighty-one million, nine hundred ninety-one thousand, two hundred sixty-four".