21311222012002 has 8 divisors (see below), whose sum is σ = 34425820173276. Its totient is φ = 9835948620912.

The previous prime is 21311222011951. The next prime is 21311222012009. The reversal of 21311222012002 is 20021022211312.

It can be written as a sum of positive squares in 2 ways, for example, as 20094769632961 + 1216452379041 = 4482719^2 + 1102929^2 .

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 (21311222012009) 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, 409831192513 + ... + 409831192564.

Almost surely, 2^{21311222012002} is an apocalyptic number.

21311222012002 is a deficient number, since it is larger than the sum of its proper divisors (13114598161274).

21311222012002 is a wasteful number, since it uses less digits than its factorization.

21311222012002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 819662385092.

The product of its (nonzero) digits is 192, while the sum is 19.

Adding to 21311222012002 its reverse (20021022211312), we get a palindrome (41332244223314).

The spelling of 21311222012002 in words is "twenty-one trillion, three hundred eleven billion, two hundred twenty-two million, twelve thousand, two".