21121001098973 has 2 divisors, whose sum is σ = 21121001098974. Its totient is φ = 21121001098972.

The previous prime is 21121001098957. The next prime is 21121001099119. The reversal of 21121001098973 is 37989010012112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19895899672324 + 1225101426649 = 4460482^2 + 1106843^2 .

It is a cyclic number.

It is not a de Polignac number, because 21121001098973 - 2⁴ = 21121001098957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21121001098073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560500549486 + 10560500549487.

It is an arithmetic number, because the mean of its divisors is an integer number (10560500549487).

Almost surely, 2^{21121001098973} is an apocalyptic number.

It is an amenable number.

21121001098973 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121001098973 is an equidigital number, since it uses as much as digits as its factorization.

21121001098973 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54432, while the sum is 44.

The spelling of 21121001098973 in words is "twenty-one trillion, one hundred twenty-one billion, one million, ninety-eight thousand, nine hundred seventy-three".