101218990 has 32 divisors (see below), whose sum is σ = 192883680. Its totient is φ = 38177664.

The previous prime is 101218979. The next prime is 101218991. The reversal of 101218990 is 99812101.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101218991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8412 + ... + 16528.

It is an arithmetic number, because the mean of its divisors is an integer number (6027615).

Almost surely, 2^101218990 is an apocalyptic number.

101218990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

101218990 is a deficient number, since it is larger than the sum of its proper divisors (91664690).

101218990 is a wasteful number, since it uses less digits than its factorization.

101218990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8196.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 101218990 is about 10060.7648814591. The cubic root of 101218990 is about 466.0372881802.

It can be divided in two parts, 1012 and 18990, that added together give a palindrome (20002).

The spelling of 101218990 in words is "one hundred one million, two hundred eighteen thousand, nine hundred ninety".