212745421 has 8 divisors (see below), whose sum is σ = 251521920. Its totient is φ = 176065008.

The previous prime is 212745397. The next prime is 212745427. The reversal of 212745421 is 124547212.

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

It is not a de Polignac number, because 212745421 - 2⁵ = 212745389 is a prime.

It is a super-2 number, since 2×212745421² = 90521228312934482, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 212745421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212745427) 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, 523801 + ... + 524206.

It is an arithmetic number, because the mean of its divisors is an integer number (31440240).

Almost surely, 2^212745421 is an apocalyptic number.

It is an amenable number.

212745421 is a deficient number, since it is larger than the sum of its proper divisors (38776499).

212745421 is a wasteful number, since it uses less digits than its factorization.

212745421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1048043.

The product of its digits is 4480, while the sum is 28.

The square root of 212745421 is about 14585.7951788718. The cubic root of 212745421 is about 596.9712376496.

The spelling of 212745421 in words is "two hundred twelve million, seven hundred forty-five thousand, four hundred twenty-one".