127989621029 has 12 divisors (see below), whose sum is σ = 136167186468. Its totient is φ = 120278400000.

The previous prime is 127989620999. The next prime is 127989621073. The reversal of 127989621029 is 920126989721.

It can be written as a sum of positive squares in 6 ways, for example, as 59763136225 + 68226484804 = 244465^2 + 261202^2 .

It is a de Polignac number, because none of the positive numbers 2^k-127989621029 is a prime.

It is a super-2 number, since 2×127989621029² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (127989621079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 143972 + ... + 526029.

It is an arithmetic number, because the mean of its divisors is an integer number (11347265539).

Almost surely, 2^127989621029 is an apocalyptic number.

It is an amenable number.

127989621029 is a deficient number, since it is larger than the sum of its proper divisors (8177565439).

127989621029 is an equidigital number, since it uses as much as digits as its factorization.

127989621029 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670696 (or 670679 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 56.

The spelling of 127989621029 in words is "one hundred twenty-seven billion, nine hundred eighty-nine million, six hundred twenty-one thousand, twenty-nine".