121736235640 has 16 divisors (see below), whose sum is σ = 273906530280. Its totient is φ = 48694494240.

The previous prime is 121736235637. The next prime is 121736235679. The reversal of 121736235640 is 46532637121.

It is a happy number.

It is a super-2 number, since 2×121736235640² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (40), and also a Moran number because the ratio is a prime number: 3043405891 = 121736235640 / (1 + 2 + 1 + 7 + 3 + 6 + 2 + 3 + 5 + 6 + 4 + 0).

It is a junction number, because it is equal to n+sod(n) for n = 121736235593 and 121736235602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1521702906 + ... + 1521702985.

Almost surely, 2^121736235640 is an apocalyptic number.

121736235640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

121736235640 is an abundant number, since it is smaller than the sum of its proper divisors (152170294640).

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

121736235640 is a wasteful number, since it uses less digits than its factorization.

121736235640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3043405902 (or 3043405898 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The spelling of 121736235640 in words is "one hundred twenty-one billion, seven hundred thirty-six million, two hundred thirty-five thousand, six hundred forty".