211215980 has 48 divisors (see below), whose sum is σ = 461435520. Its totient is φ = 81139968.

The previous prime is 211215941. The next prime is 211216001. The reversal of 211215980 is 89512112.

It is a super-2 number, since 2×211215980² = 89224380414720800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 56654 + ... + 60266.

It is an arithmetic number, because the mean of its divisors is an integer number (9613240).

Almost surely, 2^211215980 is an apocalyptic number.

211215980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 211215980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (230717760).

211215980 is an abundant number, since it is smaller than the sum of its proper divisors (250219540).

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

211215980 is a wasteful number, since it uses less digits than its factorization.

211215980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3738 (or 3736 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 29.

The square root of 211215980 is about 14533.2714830488. The cubic root of 211215980 is about 595.5372404446.

The spelling of 211215980 in words is "two hundred eleven million, two hundred fifteen thousand, nine hundred eighty".