121572500540 has 96 divisors (see below), whose sum is σ = 279173744640. Its totient is φ = 44312486400.

The previous prime is 121572500531. The next prime is 121572500549. The reversal of 121572500540 is 45005275121.

It is an interprime number because it is at equal distance from previous prime (121572500531) and next prime (121572500549).

It is a junction number, because it is equal to n+sod(n) for n = 121572500497 and 121572500506.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121572500549) 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, 1051229 + ... + 1161131.

It is an arithmetic number, because the mean of its divisors is an integer number (2908059840).

Almost surely, 2^121572500540 is an apocalyptic number.

121572500540 is a gapful number since it is divisible by the number (10) 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 121572500540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (139586872320).

121572500540 is an abundant number, since it is smaller than the sum of its proper divisors (157601244100).

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

121572500540 is a wasteful number, since it uses less digits than its factorization.

121572500540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110043 (or 110041 counting only the distinct ones).

The product of its (nonzero) digits is 14000, while the sum is 32.

Adding to 121572500540 its reverse (45005275121), we get a palindrome (166577775661).

The spelling of 121572500540 in words is "one hundred twenty-one billion, five hundred seventy-two million, five hundred thousand, five hundred forty".