20211999967 has 2 divisors, whose sum is σ = 20211999968. Its totient is φ = 20211999966.

The previous prime is 20211999923. The next prime is 20211999971. The reversal of 20211999967 is 76999911202.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20211999967 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20211999667) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10105999983 + 10105999984.

It is an arithmetic number, because the mean of its divisors is an integer number (10105999984).

Almost surely, 2^20211999967 is an apocalyptic number.

20211999967 is a deficient number, since it is larger than the sum of its proper divisors (1).

20211999967 is an equidigital number, since it uses as much as digits as its factorization.

20211999967 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1102248, while the sum is 55.

The spelling of 20211999967 in words is "twenty billion, two hundred eleven million, nine hundred ninety-nine thousand, nine hundred sixty-seven".