21227128404 has 48 divisors (see below), whose sum is σ = 53226266688. Its totient is φ = 6560091648.

The previous prime is 21227128393. The next prime is 21227128409. The reversal of 21227128404 is 40482172212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21227128409) 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, 762859 + ... + 790194.

It is an arithmetic number, because the mean of its divisors is an integer number (1108880556).

Almost surely, 2^21227128404 is an apocalyptic number.

It is an amenable number.

21227128404 is an abundant number, since it is smaller than the sum of its proper divisors (31999138284).

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

21227128404 is a wasteful number, since it uses less digits than its factorization.

21227128404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1553144 (or 1553142 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 33.

The spelling of 21227128404 in words is "twenty-one billion, two hundred twenty-seven million, one hundred twenty-eight thousand, four hundred four".