921214326728 has 64 divisors (see below), whose sum is σ = 1782254257920. Its totient is φ = 446152896000.

The previous prime is 921214326727. The next prime is 921214326733. The reversal of 921214326728 is 827623412129.

It is a super-3 number, since 3×921214326728³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is not an unprimeable number, because it can be changed into a prime (921214326727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135608900 + ... + 135615692.

It is an arithmetic number, because the mean of its divisors is an integer number (27847722780).

Almost surely, 2^921214326728 is an apocalyptic number.

It is an amenable number.

921214326728 is a deficient number, since it is larger than the sum of its proper divisors (861039931192).

921214326728 is a wasteful number, since it uses less digits than its factorization.

921214326728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10518 (or 10514 counting only the distinct ones).

The product of its digits is 580608, while the sum is 47.

The spelling of 921214326728 in words is "nine hundred twenty-one billion, two hundred fourteen million, three hundred twenty-six thousand, seven hundred twenty-eight".