988920012221 has 2 divisors, whose sum is σ = 988920012222. Its totient is φ = 988920012220.

The previous prime is 988920012209. The next prime is 988920012257. The reversal of 988920012221 is 122210029889.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 920859028996 + 68060983225 = 959614^2 + 260885^2 .

It is an emirp because it is prime and its reverse (122210029889) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-988920012221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (988920012271) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494460006110 + 494460006111.

It is an arithmetic number, because the mean of its divisors is an integer number (494460006111).

Almost surely, 2^988920012221 is an apocalyptic number.

It is an amenable number.

988920012221 is a deficient number, since it is larger than the sum of its proper divisors (1).

988920012221 is an equidigital number, since it uses as much as digits as its factorization.

988920012221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 44.

The spelling of 988920012221 in words is "nine hundred eighty-eight billion, nine hundred twenty million, twelve thousand, two hundred twenty-one".