20211321019 has 2 divisors, whose sum is σ = 20211321020. Its totient is φ = 20211321018.

The previous prime is 20211320999. The next prime is 20211321023. The reversal of 20211321019 is 91012311202.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 20211321019 - 2⁷ = 20211320891 is a prime.

It is a super-2 number, since 2×20211321019² (a number of 21 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (20211321049) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105660509 + 10105660510.

It is an arithmetic number, because the mean of its divisors is an integer number (10105660510).

Almost surely, 2^20211321019 is an apocalyptic number.

20211321019 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211321019 is an equidigital number, since it uses as much as digits as its factorization.

20211321019 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 216, while the sum is 22.

The spelling of 20211321019 in words is "twenty billion, two hundred eleven million, three hundred twenty-one thousand, nineteen".