28402221000021 has 16 divisors (see below), whose sum is σ = 41420186542080. Its totient is φ = 17168523486320.

The previous prime is 28402221000019. The next prime is 28402221000037. The reversal of 28402221000021 is 12000012220482.

It is a cyclic number.

It is not a de Polignac number, because 28402221000021 - 2¹ = 28402221000019 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28402220999955 and 28402221000000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28402221004021) 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, 1123581831 + ... + 1123607108.

It is an arithmetic number, because the mean of its divisors is an integer number (2588761658880).

Almost surely, 2^{28402221000021} is an apocalyptic number.

It is an amenable number.

28402221000021 is a deficient number, since it is larger than the sum of its proper divisors (13017965542059).

28402221000021 is a wasteful number, since it uses less digits than its factorization.

28402221000021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2247189336.

The product of its (nonzero) digits is 1024, while the sum is 24.

The spelling of 28402221000021 in words is "twenty-eight trillion, four hundred two billion, two hundred twenty-one million, twenty-one", and thus it is an aban number.