121602156001 has 4 divisors (see below), whose sum is σ = 121602872212. Its totient is φ = 121601439792.

The previous prime is 121602155999. The next prime is 121602156029. The reversal of 121602156001 is 100651206121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 66151325601 + 55450830400 = 257199^2 + 235480^2 .

It is a cyclic number.

It is not a de Polignac number, because 121602156001 - 2¹ = 121602155999 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121602156061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56851 + ... + 496423.

It is an arithmetic number, because the mean of its divisors is an integer number (30400718053).

Almost surely, 2^121602156001 is an apocalyptic number.

It is an amenable number.

121602156001 is a deficient number, since it is larger than the sum of its proper divisors (716211).

121602156001 is an equidigital number, since it uses as much as digits as its factorization.

121602156001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716210.

The product of its (nonzero) digits is 720, while the sum is 25.

The spelling of 121602156001 in words is "one hundred twenty-one billion, six hundred two million, one hundred fifty-six thousand, one".