21112100100989 has 2 divisors, whose sum is σ = 21112100100990. Its totient is φ = 21112100100988.

The previous prime is 21112100100983. The next prime is 21112100101003. The reversal of 21112100100989 is 98900100121112.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19110842844025 + 2001257256964 = 4371595^2 + 1414658^2 .

It is a cyclic number.

It is not a de Polignac number, because 21112100100989 - 2³² = 21107805133693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21112100100983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10556050050494 + 10556050050495.

It is an arithmetic number, because the mean of its divisors is an integer number (10556050050495).

Almost surely, 2^{21112100100989} is an apocalyptic number.

It is an amenable number.

21112100100989 is a deficient number, since it is larger than the sum of its proper divisors (1).

21112100100989 is an equidigital number, since it uses as much as digits as its factorization.

21112100100989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 35.

The spelling of 21112100100989 in words is "twenty-one trillion, one hundred twelve billion, one hundred million, one hundred thousand, nine hundred eighty-nine".