211421021 has 8 divisors (see below), whose sum is σ = 241906560. Its totient is φ = 181006128.

The previous prime is 211421009. The next prime is 211421033. The reversal of 211421021 is 120124112.

It is a happy number.

211421021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (211421009) and next prime (211421033).

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-211421021 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211420987 and 211421005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211421321) 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, 11081 + ... + 23358.

It is an arithmetic number, because the mean of its divisors is an integer number (30238320).

Almost surely, 2^211421021 is an apocalyptic number.

It is an amenable number.

211421021 is a deficient number, since it is larger than the sum of its proper divisors (30485539).

211421021 is an equidigital number, since it uses as much as digits as its factorization.

211421021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35323.

The product of its (nonzero) digits is 32, while the sum is 14.

The square root of 211421021 is about 14540.3239647540. The cubic root of 211421021 is about 595.7298869470.

Adding to 211421021 its reverse (120124112), we get a palindrome (331545133).

The spelling of 211421021 in words is "two hundred eleven million, four hundred twenty-one thousand, twenty-one".