21123131222002 has 128 divisors (see below), whose sum is σ = 35684316315648. Its totient is φ = 9330268953600.

The previous prime is 21123131221999. The next prime is 21123131222003. The reversal of 21123131222002 is 20022213132112.

It is not an unprimeable number, because it can be changed into a prime (21123131222003) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7276309683 + ... + 7276312585.

It is an arithmetic number, because the mean of its divisors is an integer number (278783721216).

Almost surely, 2^{21123131222002} is an apocalyptic number.

21123131222002 is a deficient number, since it is larger than the sum of its proper divisors (14561185093646).

21123131222002 is a wasteful number, since it uses less digits than its factorization.

21123131222002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4064.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 21123131222002 its reverse (20022213132112), we get a palindrome (41145344354114).

The spelling of 21123131222002 in words is "twenty-one trillion, one hundred twenty-three billion, one hundred thirty-one million, two hundred twenty-two thousand, two".