211421004 has 12 divisors (see below), whose sum is σ = 493315704. Its totient is φ = 70473664.

The previous prime is 211420949. The next prime is 211421009. The reversal of 211421004 is 400124112.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (211421009) 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, 8809197 + ... + 8809220.

It is an arithmetic number, because the mean of its divisors is an integer number (41109642).

Almost surely, 2^211421004 is an apocalyptic number.

It is an amenable number.

211421004 is an abundant number, since it is smaller than the sum of its proper divisors (281894700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211421004 is a wasteful number, since it uses less digits than its factorization.

211421004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17618424 (or 17618422 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

The square root of 211421004 is about 14540.3233801728. The cubic root of 211421004 is about 595.7298709798.

Adding to 211421004 its reverse (400124112), we get a palindrome (611545116).

The spelling of 211421004 in words is "two hundred eleven million, four hundred twenty-one thousand, four".