121762720121 has 8 divisors (see below), whose sum is σ = 139171920384. Its totient is φ = 104357151360.

The previous prime is 121762720109. The next prime is 121762720127. The reversal of 121762720121 is 121027267121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-121762720121 is a prime.

It is a super-2 number, since 2×121762720121² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (121762720127) 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, 835640 + ... + 970473.

It is an arithmetic number, because the mean of its divisors is an integer number (17396490048).

Almost surely, 2^121762720121 is an apocalyptic number.

It is an amenable number.

121762720121 is a deficient number, since it is larger than the sum of its proper divisors (17409200263).

121762720121 is an equidigital number, since it uses as much as digits as its factorization.

121762720121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1815751.

The product of its (nonzero) digits is 4704, while the sum is 32.

Adding to 121762720121 its reverse (121027267121), we get a palindrome (242789987242).

The spelling of 121762720121 in words is "one hundred twenty-one billion, seven hundred sixty-two million, seven hundred twenty thousand, one hundred twenty-one".