28221032210021 has 16 divisors (see below), whose sum is σ = 33162079829760. Its totient is φ = 23511739009920.

The previous prime is 28221032209957. The next prime is 28221032210053. The reversal of 28221032210021 is 12001223012282.

It is a happy number.

It is not a de Polignac number, because 28221032210021 - 2⁶ = 28221032209957 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28221032240021) 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, 182694401 + ... + 182848806.

It is an arithmetic number, because the mean of its divisors is an integer number (2072629989360).

Almost surely, 2^{28221032210021} is an apocalyptic number.

It is an amenable number.

28221032210021 is a deficient number, since it is larger than the sum of its proper divisors (4941047619739).

28221032210021 is a wasteful number, since it uses less digits than its factorization.

28221032210021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 365543524.

The product of its (nonzero) digits is 1536, while the sum is 26.

The spelling of 28221032210021 in words is "twenty-eight trillion, two hundred twenty-one billion, thirty-two million, two hundred ten thousand, twenty-one".