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100166021 is a prime number
BaseRepresentation
bin1011111100001…
…10100110000101
320222110221221122
411332012212011
5201120303041
613534523325
72324253134
oct576064605
9228427848
10100166021
11515a523a
1229666545
13179a1247
14d43591b
158bd8c4b
hex5f86985

100166021 has 2 divisors, whose sum is σ = 100166022. Its totient is φ = 100166020.

The previous prime is 100165999. The next prime is 100166051. The reversal of 100166021 is 120661001.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 82609921 + 17556100 = 9089^2 + 4190^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-100166021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (100166051) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50083010 + 50083011.

It is an arithmetic number, because the mean of its divisors is an integer number (50083011).

Almost surely, 2100166021 is an apocalyptic number.

It is an amenable number.

100166021 is a deficient number, since it is larger than the sum of its proper divisors (1).

100166021 is an equidigital number, since it uses as much as digits as its factorization.

100166021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 17.

The square root of 100166021 is about 10008.2976074855. The cubic root of 100166021 is about 464.4156084144.

The spelling of 100166021 in words is "one hundred million, one hundred sixty-six thousand, twenty-one".