121388737536 has 176 divisors, whose sum is σ = 392177033280. Its totient is φ = 36784373760.

The previous prime is 121388737529. The next prime is 121388737583. The reversal of 121388737536 is 635737883121.

It is a happy number.

121388737536 is a `hidden beast` number, since 1 + 2 + 1 + 38 + 8 + 73 + 7 + 536 = 666.

It is a tau number, because it is divible by the number of its divisors (176).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 104560 + ... + 503696.

Almost surely, 2^121388737536 is an apocalyptic number.

121388737536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121388737536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196088516640).

121388737536 is an abundant number, since it is smaller than the sum of its proper divisors (270788295744).

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

121388737536 is a wasteful number, since it uses less digits than its factorization.

121388737536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 399177 (or 399153 counting only the distinct ones).

The product of its digits is 5080320, while the sum is 54.

The spelling of 121388737536 in words is "one hundred twenty-one billion, three hundred eighty-eight million, seven hundred thirty-seven thousand, five hundred thirty-six".