121651542045 has 36 divisors (see below), whose sum is σ = 231774683868. Its totient is φ = 58982563200.

The previous prime is 121651541923. The next prime is 121651542053. The reversal of 121651542045 is 540245156121.

121651542045 is a `hidden beast` number, since 1 + 21 + 6 + 51 + 542 + 0 + 45 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 84370497156 + 37281044889 = 290466^2 + 193083^2 .

It is not a de Polignac number, because 121651542045 - 2⁹ = 121651541533 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 11165496 + ... + 11176385.

It is an arithmetic number, because the mean of its divisors is an integer number (6438185663).

Almost surely, 2^121651542045 is an apocalyptic number.

121651542045 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121651542045 is a deficient number, since it is larger than the sum of its proper divisors (110123141823).

121651542045 is a wasteful number, since it uses less digits than its factorization.

121651542045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22341914 (or 22341900 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 36.

Adding to 121651542045 its reverse (540245156121), we get a palindrome (661896698166).

The spelling of 121651542045 in words is "one hundred twenty-one billion, six hundred fifty-one million, five hundred forty-two thousand, forty-five".