121754531851 has 16 divisors (see below), whose sum is σ = 125881269696. Its totient is φ = 117672794496.

The previous prime is 121754531849. The next prime is 121754531867. The reversal of 121754531851 is 158135457121.

It is a cyclic number.

It is not a de Polignac number, because 121754531851 - 2¹ = 121754531849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 121754531798 and 121754531807.

It is not an unprimeable number, because it can be changed into a prime (121754531881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10109005 + ... + 10121041.

It is an arithmetic number, because the mean of its divisors is an integer number (7867579356).

Almost surely, 2^121754531851 is an apocalyptic number.

121754531851 is a deficient number, since it is larger than the sum of its proper divisors (4126737845).

121754531851 is a wasteful number, since it uses less digits than its factorization.

121754531851 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13878.

The product of its digits is 168000, while the sum is 43.

Adding to 121754531851 its reverse (158135457121), we get a palindrome (279889988972).

The spelling of 121754531851 in words is "one hundred twenty-one billion, seven hundred fifty-four million, five hundred thirty-one thousand, eight hundred fifty-one".