21053401215239 has 2 divisors, whose sum is σ = 21053401215240. Its totient is φ = 21053401215238.

The previous prime is 21053401215181. The next prime is 21053401215271. The reversal of 21053401215239 is 93251210435012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21053401215239 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21053401215299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10526700607619 + 10526700607620.

It is an arithmetic number, because the mean of its divisors is an integer number (10526700607620).

Almost surely, 2^{21053401215239} is an apocalyptic number.

21053401215239 is a deficient number, since it is larger than the sum of its proper divisors (1).

21053401215239 is an equidigital number, since it uses as much as digits as its factorization.

21053401215239 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64800, while the sum is 38.

The spelling of 21053401215239 in words is "twenty-one trillion, fifty-three billion, four hundred one million, two hundred fifteen thousand, two hundred thirty-nine".