21221468708428 has 24 divisors (see below), whose sum is σ = 37282616747712. Its totient is φ = 10569293697024.

The previous prime is 21221468708423. The next prime is 21221468708431. The reversal of 21221468708428 is 82480786412212.

21221468708428 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (21221468708423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109429326 + ... + 109623082.

It is an arithmetic number, because the mean of its divisors is an integer number (1553442364488).

Almost surely, 2^{21221468708428} is an apocalyptic number.

It is an amenable number.

21221468708428 is a deficient number, since it is larger than the sum of its proper divisors (16061148039284).

21221468708428 is a wasteful number, since it uses less digits than its factorization.

21221468708428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 300561 (or 300559 counting only the distinct ones).

The product of its (nonzero) digits is 5505024, while the sum is 55.

The spelling of 21221468708428 in words is "twenty-one trillion, two hundred twenty-one billion, four hundred sixty-eight million, seven hundred eight thousand, four hundred twenty-eight".