21221041413 has 96 divisors (see below), whose sum is σ = 35170910208. Its totient is φ = 11208758400.

The previous prime is 21221041409. The next prime is 21221041417. The reversal of 21221041413 is 31414012212.

It is an interprime number because it is at equal distance from previous prime (21221041409) and next prime (21221041417).

It is not a de Polignac number, because 21221041413 - 2² = 21221041409 is a prime.

It is a super-2 number, since 2×21221041413² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21221041413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221041417) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 24589420 + ... + 24590282.

It is an arithmetic number, because the mean of its divisors is an integer number (366363648).

Almost surely, 2^21221041413 is an apocalyptic number.

It is an amenable number.

21221041413 is a deficient number, since it is larger than the sum of its proper divisors (13949868795).

21221041413 is a wasteful number, since it uses less digits than its factorization.

21221041413 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1007 (or 964 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21221041413 its reverse (31414012212), we get a palindrome (52635053625).

The spelling of 21221041413 in words is "twenty-one billion, two hundred twenty-one million, forty-one thousand, four hundred thirteen".