212691420 has 120 divisors (see below), whose sum is σ = 706560624. Its totient is φ = 53374464.

The previous prime is 212691397. The next prime is 212691421. The reversal of 212691420 is 24196212.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212691421) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 23679 + ... + 31401.

Almost surely, 2^212691420 is an apocalyptic number.

212691420 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 212691420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (353280312).

212691420 is an abundant number, since it is smaller than the sum of its proper divisors (493869204).

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

212691420 is a wasteful number, since it uses less digits than its factorization.

212691420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7761 (or 7750 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 27.

The square root of 212691420 is about 14583.9439110276. The cubic root of 212691420 is about 596.9207237982.

The spelling of 212691420 in words is "two hundred twelve million, six hundred ninety-one thousand, four hundred twenty".