23121011219987 has 2 divisors, whose sum is σ = 23121011219988. Its totient is φ = 23121011219986.

The previous prime is 23121011219983. The next prime is 23121011220029. The reversal of 23121011219987 is 78991211012132.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 23121011219987 - 2² = 23121011219983 is a prime.

It is not a weakly prime, because it can be changed into another prime (23121011219983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11560505609993 + 11560505609994.

It is an arithmetic number, because the mean of its divisors is an integer number (11560505609994).

Almost surely, 2^{23121011219987} is an apocalyptic number.

23121011219987 is a deficient number, since it is larger than the sum of its proper divisors (1).

23121011219987 is an equidigital number, since it uses as much as digits as its factorization.

23121011219987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108864, while the sum is 47.

The spelling of 23121011219987 in words is "twenty-three trillion, one hundred twenty-one billion, eleven million, two hundred nineteen thousand, nine hundred eighty-seven".