212121629 has 8 divisors (see below), whose sum is σ = 219303168. Its totient is φ = 205016400.

The previous prime is 212121607. The next prime is 212121649. The reversal of 212121629 is 926121212.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-212121629 is a prime.

It is a super-2 number, since 2×212121629² = 89991170979227282, 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 = 212121598 and 212121607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212121649) 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 7 ways as a sum of consecutive naturals, for example, 13397 + ... + 24570.

It is an arithmetic number, because the mean of its divisors is an integer number (27412896).

Almost surely, 2^212121629 is an apocalyptic number.

It is an amenable number.

212121629 is a deficient number, since it is larger than the sum of its proper divisors (7181539).

212121629 is a wasteful number, since it uses less digits than its factorization.

212121629 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38155.

The product of its digits is 864, while the sum is 26.

The square root of 212121629 is about 14564.3959366669. The cubic root of 212121629 is about 596.3872055973.

The spelling of 212121629 in words is "two hundred twelve million, one hundred twenty-one thousand, six hundred twenty-nine".