21201231422402 has 8 divisors (see below), whose sum is σ = 31801959457212. Its totient is φ = 10600578270000.

The previous prime is 21201231422401. The next prime is 21201231422419. The reversal of 21201231422402 is 20422413210212.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 21200048131201 + 1183291201 = 4604351^2 + 34399^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21201231422401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18007349 + ... + 19148552.

Almost surely, 2^{21201231422402} is an apocalyptic number.

21201231422402 is a deficient number, since it is larger than the sum of its proper divisors (10600728034810).

21201231422402 is a wasteful number, since it uses less digits than its factorization.

21201231422402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37441204.

The product of its (nonzero) digits is 3072, while the sum is 26.

Adding to 21201231422402 its reverse (20422413210212), we get a palindrome (41623644632614).

The spelling of 21201231422402 in words is "twenty-one trillion, two hundred one billion, two hundred thirty-one million, four hundred twenty-two thousand, four hundred two".