221340123402 has 16 divisors (see below), whose sum is σ = 446597772480. Its totient is φ = 73127120192.

The previous prime is 221340123397. The next prime is 221340123413. The reversal of 221340123402 is 204321043122.

It is a happy number.

It is a super-2 number, since 2×221340123402² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163229502 + ... + 163230857.

It is an arithmetic number, because the mean of its divisors is an integer number (27912360780).

Almost surely, 2^221340123402 is an apocalyptic number.

221340123402 is an abundant number, since it is smaller than the sum of its proper divisors (225257649078).

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

221340123402 is a wasteful number, since it uses less digits than its factorization.

221340123402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326460477.

The product of its (nonzero) digits is 2304, while the sum is 24.

Adding to 221340123402 its reverse (204321043122), we get a palindrome (425661166524).

The spelling of 221340123402 in words is "two hundred twenty-one billion, three hundred forty million, one hundred twenty-three thousand, four hundred two".