28911021022001 has 2 divisors, whose sum is σ = 28911021022002. Its totient is φ = 28911021022000.

The previous prime is 28911021021979. The next prime is 28911021022033. The reversal of 28911021022001 is 10022012011982.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 18018539280625 + 10892481741376 = 4244825^2 + 3300376^2 .

It is a cyclic number.

It is not a de Polignac number, because 28911021022001 - 2¹⁴ = 28911021005617 is a prime.

It is not a weakly prime, because it can be changed into another prime (28911021022061) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14455510511000 + 14455510511001.

It is an arithmetic number, because the mean of its divisors is an integer number (14455510511001).

Almost surely, 2^{28911021022001} is an apocalyptic number.

It is an amenable number.

28911021022001 is a deficient number, since it is larger than the sum of its proper divisors (1).

28911021022001 is an equidigital number, since it uses as much as digits as its factorization.

28911021022001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1152, while the sum is 29.

Adding to 28911021022001 its reverse (10022012011982), we get a palindrome (38933033033983).

The spelling of 28911021022001 in words is "twenty-eight trillion, nine hundred eleven billion, twenty-one million, twenty-two thousand, one".