211421004421 has 32 divisors (see below), whose sum is σ = 236906274816. Its totient is φ = 187030296000.

The previous prime is 211421004329. The next prime is 211421004481. The reversal of 211421004421 is 124400124112.

It is a de Polignac number, because none of the positive numbers 2^k-211421004421 is a prime.

It is a super-2 number, since 2×211421004421² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211421004392 and 211421004401.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211421004481) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 79152916 + ... + 79155586.

It is an arithmetic number, because the mean of its divisors is an integer number (7403321088).

Almost surely, 2^211421004421 is an apocalyptic number.

It is an amenable number.

211421004421 is a deficient number, since it is larger than the sum of its proper divisors (25485270395).

211421004421 is a wasteful number, since it uses less digits than its factorization.

211421004421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3553.

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 211421004421 its reverse (124400124112), we get a palindrome (335821128533).

The spelling of 211421004421 in words is "two hundred eleven billion, four hundred twenty-one million, four thousand, four hundred twenty-one".