21121023429403 has 2 divisors, whose sum is σ = 21121023429404. Its totient is φ = 21121023429402.

The previous prime is 21121023429343. The next prime is 21121023429437. The reversal of 21121023429403 is 30492432012112.

It is an a-pointer prime, because the next prime (21121023429437) can be obtained adding 21121023429403 to its sum of digits (34).

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21121023429403 is a prime.

It is not a weakly prime, because it can be changed into another prime (21121023429503) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560511714701 + 10560511714702.

It is an arithmetic number, because the mean of its divisors is an integer number (10560511714702).

Almost surely, 2^{21121023429403} is an apocalyptic number.

21121023429403 is a deficient number, since it is larger than the sum of its proper divisors (1).

21121023429403 is an equidigital number, since it uses as much as digits as its factorization.

21121023429403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20736, while the sum is 34.

The spelling of 21121023429403 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-three million, four hundred twenty-nine thousand, four hundred three".