21242414121389 has 2 divisors, whose sum is σ = 21242414121390. Its totient is φ = 21242414121388.

The previous prime is 21242414121337. The next prime is 21242414121419. The reversal of 21242414121389 is 98312141424212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20439965439364 + 802448682025 = 4521058^2 + 895795^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21242414121389 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21242414121689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10621207060694 + 10621207060695.

It is an arithmetic number, because the mean of its divisors is an integer number (10621207060695).

Almost surely, 2^{21242414121389} is an apocalyptic number.

It is an amenable number.

21242414121389 is a deficient number, since it is larger than the sum of its proper divisors (1).

21242414121389 is an equidigital number, since it uses as much as digits as its factorization.

21242414121389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 221184, while the sum is 44.

The spelling of 21242414121389 in words is "twenty-one trillion, two hundred forty-two billion, four hundred fourteen million, one hundred twenty-one thousand, three hundred eighty-nine".