21211524140987 has 2 divisors, whose sum is σ = 21211524140988. Its totient is φ = 21211524140986.

The previous prime is 21211524140971. The next prime is 21211524140993. The reversal of 21211524140987 is 78904142511212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21211524140987 - 2⁴ = 21211524140971 is a prime.

It is not a weakly prime, because it can be changed into another prime (21211524140927) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605762070493 + 10605762070494.

It is an arithmetic number, because the mean of its divisors is an integer number (10605762070494).

Almost surely, 2^{21211524140987} is an apocalyptic number.

21211524140987 is a deficient number, since it is larger than the sum of its proper divisors (1).

21211524140987 is an equidigital number, since it uses as much as digits as its factorization.

21211524140987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 322560, while the sum is 47.

The spelling of 21211524140987 in words is "twenty-one trillion, two hundred eleven billion, five hundred twenty-four million, one hundred forty thousand, nine hundred eighty-seven".