21142101269 has 2 divisors, whose sum is σ = 21142101270. Its totient is φ = 21142101268.

The previous prime is 21142101199. The next prime is 21142101307. The reversal of 21142101269 is 96210124112.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21067071025 + 75030244 = 145145^2 + 8662^2 .

It is a cyclic number.

It is not a de Polignac number, because 21142101269 - 2¹² = 21142097173 is a prime.

It is a super-2 number, since 2×21142101269² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21142106269) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10571050634 + 10571050635.

It is an arithmetic number, because the mean of its divisors is an integer number (10571050635).

Almost surely, 2^21142101269 is an apocalyptic number.

It is an amenable number.

21142101269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21142101269 is an equidigital number, since it uses as much as digits as its factorization.

21142101269 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 29.

The spelling of 21142101269 in words is "twenty-one billion, one hundred forty-two million, one hundred one thousand, two hundred sixty-nine".