40022821997 has 2 divisors, whose sum is σ = 40022821998. Its totient is φ = 40022821996.

The previous prime is 40022821973. The next prime is 40022822009. The reversal of 40022821997 is 79912822004.

40022821997 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30531970756 + 9490851241 = 174734^2 + 97421^2 .

It is a cyclic number.

It is not a de Polignac number, because 40022821997 - 2¹⁶ = 40022756461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40022824997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20011410998 + 20011410999.

It is an arithmetic number, because the mean of its divisors is an integer number (20011410999).

Almost surely, 2^40022821997 is an apocalyptic number.

It is an amenable number.

40022821997 is a deficient number, since it is larger than the sum of its proper divisors (1).

40022821997 is an equidigital number, since it uses as much as digits as its factorization.

40022821997 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 44.

The spelling of 40022821997 in words is "forty billion, twenty-two million, eight hundred twenty-one thousand, nine hundred ninety-seven".