121421155501 has 8 divisors (see below), whose sum is σ = 121656140064. Its totient is φ = 121186240560.

The previous prime is 121421155481. The next prime is 121421155511. The reversal of 121421155501 is 105551124121.

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

It is a cyclic number.

It is not a de Polignac number, because 121421155501 - 2⁵ = 121421155469 is a prime.

It is a super-2 number, since 2×121421155501² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121421155501.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121421155511) 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, 4669506 + ... + 4695436.

It is an arithmetic number, because the mean of its divisors is an integer number (15207017508).

Almost surely, 2^121421155501 is an apocalyptic number.

It is an amenable number.

121421155501 is a deficient number, since it is larger than the sum of its proper divisors (234984563).

121421155501 is an equidigital number, since it uses as much as digits as its factorization.

121421155501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34811.

The product of its (nonzero) digits is 2000, while the sum is 28.

Adding to 121421155501 its reverse (105551124121), we get a palindrome (226972279622).

The spelling of 121421155501 in words is "one hundred twenty-one billion, four hundred twenty-one million, one hundred fifty-five thousand, five hundred one".