121345787890 has 16 divisors (see below), whose sum is σ = 220355362008. Its totient is φ = 48108772096.

The previous prime is 121345787879. The next prime is 121345787897. The reversal of 121345787890 is 98787543121.

It can be written as a sum of positive squares in 4 ways, for example, as 29247498361 + 92098289529 = 171019^2 + 303477^2 .

It is not an unprimeable number, because it can be changed into a prime (121345787897) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53691697 + ... + 53693956.

Almost surely, 2^121345787890 is an apocalyptic number.

121345787890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

121345787890 is a deficient number, since it is larger than the sum of its proper divisors (99009574118).

121345787890 is a wasteful number, since it uses less digits than its factorization.

121345787890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107385773.

The product of its (nonzero) digits is 3386880, while the sum is 55.

The spelling of 121345787890 in words is "one hundred twenty-one billion, three hundred forty-five million, seven hundred eighty-seven thousand, eight hundred ninety".