100821607 has 4 divisors (see below), whose sum is σ = 101126536. Its totient is φ = 100516680.

The previous prime is 100821587. The next prime is 100821613. The reversal of 100821607 is 706128001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 706128001 = 127 ⋅5560063.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-100821607 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (100821647) 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, 151968 + ... + 152629.

It is an arithmetic number, because the mean of its divisors is an integer number (25281634).

Almost surely, 2^100821607 is an apocalyptic number.

100821607 is a deficient number, since it is larger than the sum of its proper divisors (304929).

100821607 is an equidigital number, since it uses as much as digits as its factorization.

100821607 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304928.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 100821607 is about 10040.9963151074. The cubic root of 100821607 is about 465.4266050698.

Adding to 100821607 its reverse (706128001), we get a palindrome (806949608).

The spelling of 100821607 in words is "one hundred million, eight hundred twenty-one thousand, six hundred seven".