101215998 has 48 divisors (see below), whose sum is σ = 237837600. Its totient is φ = 30923712.

The previous prime is 101215997. The next prime is 101215999. The reversal of 101215998 is 899512101.

It is an interprime number because it is at equal distance from previous prime (101215997) and next prime (101215999).

It is a super-2 number, since 2×101215998² = 20489356502272008, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (101215993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33415 + ... + 36317.

It is an arithmetic number, because the mean of its divisors is an integer number (4954950).

Almost surely, 2^101215998 is an apocalyptic number.

101215998 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 101215998, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (118918800).

101215998 is an abundant number, since it is smaller than the sum of its proper divisors (136621602).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

101215998 is a wasteful number, since it uses less digits than its factorization.

101215998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3073 (or 3070 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 36.

The square root of 101215998 is about 10060.6161839124. The cubic root of 101215998 is about 466.0326961653.

The spelling of 101215998 in words is "one hundred one million, two hundred fifteen thousand, nine hundred ninety-eight".