101678021 has 2 divisors, whose sum is σ = 101678022. Its totient is φ = 101678020.

The previous prime is 101678011. The next prime is 101678051. The reversal of 101678021 is 120876101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 95277121 + 6400900 = 9761^2 + 2530^2 .

It is a cyclic number.

It is not a de Polignac number, because 101678021 - 2⁶ = 101677957 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101678011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50839010 + 50839011.

It is an arithmetic number, because the mean of its divisors is an integer number (50839011).

Almost surely, 2^101678021 is an apocalyptic number.

It is an amenable number.

101678021 is a deficient number, since it is larger than the sum of its proper divisors (1).

101678021 is an equidigital number, since it uses as much as digits as its factorization.

101678021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 672, while the sum is 26.

The square root of 101678021 is about 10083.5520031386. The cubic root of 101678021 is about 466.7407233378.

The spelling of 101678021 in words is "one hundred one million, six hundred seventy-eight thousand, twenty-one".