121278327621 has 32 divisors (see below), whose sum is σ = 178375067136. Its totient is φ = 72682920000.

The previous prime is 121278327619. The next prime is 121278327623. The reversal of 121278327621 is 126723872121.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (121278327619) and next prime (121278327623).

It is not a de Polignac number, because 121278327621 - 2¹ = 121278327619 is a prime.

It is a super-2 number, since 2×121278327621² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121278327623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2680630 + ... + 2725496.

It is an arithmetic number, because the mean of its divisors is an integer number (5574220848).

Almost surely, 2^121278327621 is an apocalyptic number.

121278327621 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121278327621 is a deficient number, since it is larger than the sum of its proper divisors (57096739515).

121278327621 is a wasteful number, since it uses less digits than its factorization.

121278327621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45793.

The product of its digits is 112896, while the sum is 42.

The spelling of 121278327621 in words is "one hundred twenty-one billion, two hundred seventy-eight million, three hundred twenty-seven thousand, six hundred twenty-one".