212402021 has 8 divisors (see below), whose sum is σ = 228985344. Its totient is φ = 195853680.

The previous prime is 212402009. The next prime is 212402023. The reversal of 212402021 is 120204212.

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 212402021 - 2⁶ = 212401957 is a prime.

It is a super-2 number, since 2×212402021² = 90229237049768882, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 212401987 and 212402005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212402023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4640 + ... + 21126.

It is an arithmetic number, because the mean of its divisors is an integer number (28623168).

Almost surely, 2^212402021 is an apocalyptic number.

It is an amenable number.

212402021 is a deficient number, since it is larger than the sum of its proper divisors (16583323).

212402021 is a wasteful number, since it uses less digits than its factorization.

212402021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17491.

The product of its (nonzero) digits is 64, while the sum is 14.

The square root of 212402021 is about 14574.0186976688. The cubic root of 212402021 is about 596.6498671272.

Adding to 212402021 its reverse (120204212), we get a palindrome (332606233).

It can be divided in two parts, 21 and 2402021, that added together give a palindrome (2402042).

The spelling of 212402021 in words is "two hundred twelve million, four hundred two thousand, twenty-one".