221211431402 has 16 divisors (see below), whose sum is σ = 357361466112. Its totient is φ = 102091891440.

The previous prime is 221211431401. The next prime is 221211431443. The reversal of 221211431402 is 204134112122.

221211431402 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (221211431401) 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, 257603 + ... + 713289.

It is an arithmetic number, because the mean of its divisors is an integer number (22335091632).

Almost surely, 2^221211431402 is an apocalyptic number.

221211431402 is a deficient number, since it is larger than the sum of its proper divisors (136150034710).

221211431402 is a wasteful number, since it uses less digits than its factorization.

221211431402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474373.

The product of its (nonzero) digits is 768, while the sum is 23.

Adding to 221211431402 its reverse (204134112122), we get a palindrome (425345543524).

The spelling of 221211431402 in words is "two hundred twenty-one billion, two hundred eleven million, four hundred thirty-one thousand, four hundred two".