211220314421 has 8 divisors (see below), whose sum is σ = 215812122240. Its totient is φ = 206726163564.

The previous prime is 211220314387. The next prime is 211220314427. The reversal of 211220314421 is 124413022112.

It is not a de Polignac number, because 211220314421 - 2³⁴ = 194040445237 is a prime.

It is a super-2 number, since 2×211220314421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211220314427) 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, 913391 + ... + 1121036.

It is an arithmetic number, because the mean of its divisors is an integer number (26976515280).

Almost surely, 2^211220314421 is an apocalyptic number.

It is an amenable number.

211220314421 is a deficient number, since it is larger than the sum of its proper divisors (4591807819).

211220314421 is an frugal number, since it uses more digits than its factorization.

211220314421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2034568 (or 2034474 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 211220314421 its reverse (124413022112), we get a palindrome (335633336533).

The spelling of 211220314421 in words is "two hundred eleven billion, two hundred twenty million, three hundred fourteen thousand, four hundred twenty-one".