121547929949 has 4 divisors (see below), whose sum is σ = 127945189440. Its totient is φ = 115150670460.

The previous prime is 121547929891. The next prime is 121547929963. The reversal of 121547929949 is 949929745121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 121547929949 - 2³² = 117252962653 is a prime.

It is a super-2 number, since 2×121547929949² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121547929891 and 121547929900.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121547929049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3198629717 + ... + 3198629754.

It is an arithmetic number, because the mean of its divisors is an integer number (31986297360).

Almost surely, 2^121547929949 is an apocalyptic number.

121547929949 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

121547929949 is a deficient number, since it is larger than the sum of its proper divisors (6397259491).

121547929949 is an equidigital number, since it uses as much as digits as its factorization.

121547929949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6397259490.

The product of its digits is 14696640, while the sum is 62.

The spelling of 121547929949 in words is "one hundred twenty-one billion, five hundred forty-seven million, nine hundred twenty-nine thousand, nine hundred forty-nine".