212454021 has 16 divisors (see below), whose sum is σ = 308742336. Its totient is φ = 129163776.

The previous prime is 212454019. The next prime is 212454023. The reversal of 212454021 is 120454212.

It is an interprime number because it is at equal distance from previous prime (212454019) and next prime (212454023).

It is not a de Polignac number, because 212454021 - 2¹ = 212454019 is a prime.

It is a super-2 number, since 2×212454021² = 90273422078136882, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212454023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 29580 + ... + 36053.

It is an arithmetic number, because the mean of its divisors is an integer number (19296396).

Almost surely, 2^212454021 is an apocalyptic number.

It is an amenable number.

212454021 is a deficient number, since it is larger than the sum of its proper divisors (96288315).

212454021 is a wasteful number, since it uses less digits than its factorization.

212454021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65732.

The product of its (nonzero) digits is 640, while the sum is 21.

The square root of 212454021 is about 14575.8025851066. The cubic root of 212454021 is about 596.6985535151.

The spelling of 212454021 in words is "two hundred twelve million, four hundred fifty-four thousand, twenty-one".