121928101 has 2 divisors, whose sum is σ = 121928102. Its totient is φ = 121928100.

The previous prime is 121928099. The next prime is 121928123. The reversal of 121928101 is 101829121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64016001 + 57912100 = 8001^2 + 7610^2 .

It is a cyclic number.

It is not a de Polignac number, because 121928101 - 2¹ = 121928099 is a prime.

Together with 121928099, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (121928171) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 60964050 + 60964051.

It is an arithmetic number, because the mean of its divisors is an integer number (60964051).

Almost surely, 2^121928101 is an apocalyptic number.

It is an amenable number.

121928101 is a deficient number, since it is larger than the sum of its proper divisors (1).

121928101 is an equidigital number, since it uses as much as digits as its factorization.

121928101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 25.

The square root of 121928101 is about 11042.1058227133. The cubic root of 121928101 is about 495.8701167134.

The spelling of 121928101 in words is "one hundred twenty-one million, nine hundred twenty-eight thousand, one hundred one".