21400144464766 has 64 divisors (see below), whose sum is σ = 33074869501440. Its totient is φ = 10380947184000.

The previous prime is 21400144464761. The next prime is 21400144464767. The reversal of 21400144464766 is 66746444100412.

It is a super-2 number, since 2×21400144464766² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21400144464761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4339917321 + ... + 4339922251.

It is an arithmetic number, because the mean of its divisors is an integer number (516794835960).

Almost surely, 2^{21400144464766} is an apocalyptic number.

21400144464766 is a deficient number, since it is larger than the sum of its proper divisors (11674725036674).

21400144464766 is a wasteful number, since it uses less digits than its factorization.

21400144464766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6481.

The product of its (nonzero) digits is 3096576, while the sum is 49.

The spelling of 21400144464766 in words is "twenty-one trillion, four hundred billion, one hundred forty-four million, four hundred sixty-four thousand, seven hundred sixty-six".