121551554011 has 2 divisors, whose sum is σ = 121551554012. Its totient is φ = 121551554010.

The previous prime is 121551553973. The next prime is 121551554083. The reversal of 121551554011 is 110455155121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 121551554011 - 2⁹ = 121551553499 is a prime.

It is not a weakly prime, because it can be changed into another prime (121551554611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60775777005 + 60775777006.

It is an arithmetic number, because the mean of its divisors is an integer number (60775777006).

Almost surely, 2^121551554011 is an apocalyptic number.

121551554011 is a deficient number, since it is larger than the sum of its proper divisors (1).

121551554011 is an equidigital number, since it uses as much as digits as its factorization.

121551554011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5000, while the sum is 31.

The spelling of 121551554011 in words is "one hundred twenty-one billion, five hundred fifty-one million, five hundred fifty-four thousand, eleven".