2221630025406 has 64 divisors (see below), whose sum is σ = 5103092033280. Its totient is φ = 637690544640.

The previous prime is 2221630025401. The next prime is 2221630025443. The reversal of 2221630025406 is 6045200361222.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2221630025401) 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, 8235196 + ... + 8500688.

It is an arithmetic number, because the mean of its divisors is an integer number (79735813020).

Almost surely, 2^{2221630025406} is an apocalyptic number.

2221630025406 is an abundant number, since it is smaller than the sum of its proper divisors (2881462007874).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2221630025406 is a wasteful number, since it uses less digits than its factorization.

2221630025406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272201.

The product of its (nonzero) digits is 34560, while the sum is 33.

Adding to 2221630025406 its reverse (6045200361222), we get a palindrome (8266830386628).

The spelling of 2221630025406 in words is "two trillion, two hundred twenty-one billion, six hundred thirty million, twenty-five thousand, four hundred six".