121755437643 has 32 divisors (see below), whose sum is σ = 191963036160. Its totient is φ = 67163765760.

The previous prime is 121755437623. The next prime is 121755437681. The reversal of 121755437643 is 346734557121.

It is not a de Polignac number, because 121755437643 - 2¹³ = 121755429451 is a prime.

It is a super-2 number, since 2×121755437643² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 121755437592 and 121755437601.

It is not an unprimeable number, because it can be changed into a prime (121755437603) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4436283 + ... + 4463643.

It is an arithmetic number, because the mean of its divisors is an integer number (5998844880).

Almost surely, 2^121755437643 is an apocalyptic number.

121755437643 is a deficient number, since it is larger than the sum of its proper divisors (70207598517).

121755437643 is a wasteful number, since it uses less digits than its factorization.

121755437643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34707.

The product of its digits is 2116800, while the sum is 48.

The spelling of 121755437643 in words is "one hundred twenty-one billion, seven hundred fifty-five million, four hundred thirty-seven thousand, six hundred forty-three".