21120424515371 has 2 divisors, whose sum is σ = 21120424515372. Its totient is φ = 21120424515370.

The previous prime is 21120424515293. The next prime is 21120424515391. The reversal of 21120424515371 is 17351542402112.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21120424515371 - 2²² = 21120420321067 is a prime.

It is not a weakly prime, because it can be changed into another prime (21120424515391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10560212257685 + 10560212257686.

It is an arithmetic number, because the mean of its divisors is an integer number (10560212257686).

Almost surely, 2^{21120424515371} is an apocalyptic number.

21120424515371 is a deficient number, since it is larger than the sum of its proper divisors (1).

21120424515371 is an equidigital number, since it uses as much as digits as its factorization.

21120424515371 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 67200, while the sum is 38.

Adding to 21120424515371 its reverse (17351542402112), we get a palindrome (38471966917483).

The spelling of 21120424515371 in words is "twenty-one trillion, one hundred twenty billion, four hundred twenty-four million, five hundred fifteen thousand, three hundred seventy-one".