211230412021 has 4 divisors (see below), whose sum is σ = 211243637344. Its totient is φ = 211217186700.

The previous prime is 211230412007. The next prime is 211230412027. The reversal of 211230412021 is 120214032112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 211230412021 - 2¹⁹ = 211229887733 is a prime.

It is a super-2 number, since 2×211230412021² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211230412021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211230412027) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6588675 + ... + 6620656.

It is an arithmetic number, because the mean of its divisors is an integer number (52810909336).

Almost surely, 2^211230412021 is an apocalyptic number.

It is an amenable number.

211230412021 is a deficient number, since it is larger than the sum of its proper divisors (13225323).

211230412021 is a wasteful number, since it uses less digits than its factorization.

211230412021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13225322.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 211230412021 its reverse (120214032112), we get a palindrome (331444444133).

The spelling of 211230412021 in words is "two hundred eleven billion, two hundred thirty million, four hundred twelve thousand, twenty-one".