100651021 has 4 divisors (see below), whose sum is σ = 101541852. Its totient is φ = 99760192.

The previous prime is 100650943. The next prime is 100651039. The reversal of 100651021 is 120156001.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9066121 + 91584900 = 3011^2 + 9570^2 .

It is a cyclic number.

It is not a de Polignac number, because 100651021 - 2⁹ = 100650509 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100650986 and 100651004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100652021) 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, 445246 + ... + 445471.

It is an arithmetic number, because the mean of its divisors is an integer number (25385463).

Almost surely, 2^100651021 is an apocalyptic number.

It is an amenable number.

100651021 is a deficient number, since it is larger than the sum of its proper divisors (890831).

100651021 is an equidigital number, since it uses as much as digits as its factorization.

100651021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890830.

The product of its (nonzero) digits is 60, while the sum is 16.

The square root of 100651021 is about 10032.4982432094. The cubic root of 100651021 is about 465.1639626820.

The spelling of 100651021 in words is "one hundred million, six hundred fifty-one thousand, twenty-one".