101220813 has 16 divisors (see below), whose sum is σ = 152500800. Its totient is φ = 66335760.

The previous prime is 101220803. The next prime is 101220869. The reversal of 101220813 is 318022101.

It is not a de Polignac number, because 101220813 - 2⁸ = 101220557 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101220803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30178 + ... + 33363.

It is an arithmetic number, because the mean of its divisors is an integer number (9531300).

Almost surely, 2^101220813 is an apocalyptic number.

It is an amenable number.

101220813 is a deficient number, since it is larger than the sum of its proper divisors (51279987).

101220813 is an equidigital number, since it uses as much as digits as its factorization.

101220813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 63609 (or 63603 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 18.

The square root of 101220813 is about 10060.8554805245. The cubic root of 101220813 is about 466.0400860111.

Adding to 101220813 its reverse (318022101), we get a palindrome (419242914).

The spelling of 101220813 in words is "one hundred one million, two hundred twenty thousand, eight hundred thirteen".