212013991 has 8 divisors (see below), whose sum is σ = 250118144. Its totient is φ = 175863960.

The previous prime is 212013941. The next prime is 212014001. The reversal of 212013991 is 199310212.

212013991 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 212013991 - 2¹⁷ = 211882919 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 (212013941) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 488295 + ... + 488728.

It is an arithmetic number, because the mean of its divisors is an integer number (31264768).

Almost surely, 2^212013991 is an apocalyptic number.

212013991 is a deficient number, since it is larger than the sum of its proper divisors (38104153).

212013991 is an equidigital number, since it uses as much as digits as its factorization.

212013991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977061.

The product of its (nonzero) digits is 972, while the sum is 28.

The square root of 212013991 is about 14560.7002235469. The cubic root of 212013991 is about 596.2863125586.

The spelling of 212013991 in words is "two hundred twelve million, thirteen thousand, nine hundred ninety-one".