121135254640 has 20 divisors (see below), whose sum is σ = 281639467224. Its totient is φ = 48454101824.

The previous prime is 121135254593. The next prime is 121135254649. The reversal of 121135254640 is 46452531121.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 121135254596 and 121135254605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121135254649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757095262 + ... + 757095421.

Almost surely, 2^121135254640 is an apocalyptic number.

121135254640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121135254640 is an abundant number, since it is smaller than the sum of its proper divisors (160504212584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121135254640 is a wasteful number, since it uses less digits than its factorization.

121135254640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514190696 (or 1514190690 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 34.

Adding to 121135254640 its reverse (46452531121), we get a palindrome (167587785761).

The spelling of 121135254640 in words is "one hundred twenty-one billion, one hundred thirty-five million, two hundred fifty-four thousand, six hundred forty".