21142999987229 has 2 divisors, whose sum is σ = 21142999987230. Its totient is φ = 21142999987228.

The previous prime is 21142999987199. The next prime is 21142999987283. The reversal of 21142999987229 is 92278999924112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20784800131225 + 358199856004 = 4559035^2 + 598498^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21142999987229 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21142999980229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571499993614 + 10571499993615.

It is an arithmetic number, because the mean of its divisors is an integer number (10571499993615).

Almost surely, 2^{21142999987229} is an apocalyptic number.

It is an amenable number.

21142999987229 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142999987229 is an equidigital number, since it uses as much as digits as its factorization.

21142999987229 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211631616, while the sum is 74.

The spelling of 21142999987229 in words is "twenty-one trillion, one hundred forty-two billion, nine hundred ninety-nine million, nine hundred eighty-seven thousand, two hundred twenty-nine".