212401021 has 8 divisors (see below), whose sum is σ = 253298304. Its totient is φ = 174142320.

The previous prime is 212401001. The next prime is 212401027. The reversal of 212401021 is 120104212.

It is a happy number.

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 212401021 - 2¹⁵ = 212368253 is a prime.

It is a super-3 number, since 3×212401021³ (a number of 26 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 212400992 and 212401010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212401027) 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, 659470 + ... + 659791.

It is an arithmetic number, because the mean of its divisors is an integer number (31662288).

Almost surely, 2^212401021 is an apocalyptic number.

It is an amenable number.

212401021 is a deficient number, since it is larger than the sum of its proper divisors (40897283).

212401021 is a wasteful number, since it uses less digits than its factorization.

212401021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1319291.

The product of its (nonzero) digits is 32, while the sum is 13.

The square root of 212401021 is about 14573.9843900012. The cubic root of 212401021 is about 596.6489307726.

Adding to 212401021 its reverse (120104212), we get a palindrome (332505233).

It can be divided in two parts, 21 and 2401021, that added together give a palindrome (2401042).

The spelling of 212401021 in words is "two hundred twelve million, four hundred one thousand, twenty-one".