211421401 has 4 divisors (see below), whose sum is σ = 223857972. Its totient is φ = 198984832.

The previous prime is 211421387. The next prime is 211421437. The reversal of 211421401 is 104124112.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 165791376 + 45630025 = 12876^2 + 6755^2 .

It is a cyclic number.

It is not a de Polignac number, because 211421401 - 2¹¹ = 211419353 is a prime.

It is not an unprimeable number, because it can be changed into a prime (211421801) 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, 6218260 + ... + 6218293.

It is an arithmetic number, because the mean of its divisors is an integer number (55964493).

Almost surely, 2^211421401 is an apocalyptic number.

It is an amenable number.

211421401 is a deficient number, since it is larger than the sum of its proper divisors (12436571).

211421401 is a wasteful number, since it uses less digits than its factorization.

211421401 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12436570.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 211421401 is about 14540.3370318573. The cubic root of 211421401 is about 595.7302438608.

Adding to 211421401 its reverse (104124112), we get a palindrome (315545513).

The spelling of 211421401 in words is "two hundred eleven million, four hundred twenty-one thousand, four hundred one".