221426003631 has 8 divisors (see below), whose sum is σ = 337411053184. Its totient is φ = 126529144920.

The previous prime is 221426003611. The next prime is 221426003633. The reversal of 221426003631 is 136300624122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 221426003631 - 2⁶ = 221426003567 is a prime.

It is a super-2 number, since 2×221426003631² (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 (221426003633) 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, 5272047685 + ... + 5272047726.

It is an arithmetic number, because the mean of its divisors is an integer number (42176381648).

Almost surely, 2^221426003631 is an apocalyptic number.

221426003631 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

221426003631 is a deficient number, since it is larger than the sum of its proper divisors (115985049553).

221426003631 is a wasteful number, since it uses less digits than its factorization.

221426003631 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10544095421.

The product of its (nonzero) digits is 10368, while the sum is 30.

Adding to 221426003631 its reverse (136300624122), we get a palindrome (357726627753).

The spelling of 221426003631 in words is "two hundred twenty-one billion, four hundred twenty-six million, three thousand, six hundred thirty-one".