10606401021991 has 2 divisors, whose sum is σ = 10606401021992. Its totient is φ = 10606401021990.

The previous prime is 10606401021971. The next prime is 10606401022057. The reversal of 10606401021991 is 19912010460601.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 10606401021991 - 2²⁹ = 10605864151079 is a prime.

It is a super-2 number, since 2×10606401021991² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (10606401021971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5303200510995 + 5303200510996.

It is an arithmetic number, because the mean of its divisors is an integer number (5303200510996).

Almost surely, 2^{10606401021991} is an apocalyptic number.

10606401021991 is a deficient number, since it is larger than the sum of its proper divisors (1).

10606401021991 is an equidigital number, since it uses as much as digits as its factorization.

10606401021991 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23328, while the sum is 40.

The spelling of 10606401021991 in words is "ten trillion, six hundred six billion, four hundred one million, twenty-one thousand, nine hundred ninety-one".