221210000421 has 64 divisors (see below), whose sum is σ = 311674521600. Its totient is φ = 139371611904.

The previous prime is 221210000393. The next prime is 221210000449. The reversal of 221210000421 is 124000012122.

It is an interprime number because it is at equal distance from previous prime (221210000393) and next prime (221210000449).

It is not a de Polignac number, because 221210000421 - 2⁷ = 221210000293 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221210000421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221210000521) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 392912686 + ... + 392913248.

It is an arithmetic number, because the mean of its divisors is an integer number (4869914400).

Almost surely, 2^221210000421 is an apocalyptic number.

It is an amenable number.

221210000421 is a deficient number, since it is larger than the sum of its proper divisors (90464521179).

221210000421 is a wasteful number, since it uses less digits than its factorization.

221210000421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1130.

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

Adding to 221210000421 its reverse (124000012122), we get a palindrome (345210012543).

The spelling of 221210000421 in words is "two hundred twenty-one billion, two hundred ten million, four hundred twenty-one", and thus it is an aban number.