21001312223130 has 64 divisors (see below), whose sum is σ = 53695175063040. Its totient is φ = 5241671827776.

The previous prime is 21001312223107. The next prime is 21001312223137. The reversal of 21001312223130 is 3132221310012.

It is a junction number, because it is equal to n+sod(n) for n = 21001312223097 and 21001312223106.

It is not an unprimeable number, because it can be changed into a prime (21001312223137) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 221906952 + ... + 222001571.

It is an arithmetic number, because the mean of its divisors is an integer number (838987110360).

Almost surely, 2^{21001312223130} is an apocalyptic number.

21001312223130 is an abundant number, since it is smaller than the sum of its proper divisors (32693862839910).

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

21001312223130 is a wasteful number, since it uses less digits than its factorization.

21001312223130 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 443908635.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 21001312223130 its reverse (3132221310012), we get a palindrome (24133533533142).

The spelling of 21001312223130 in words is "twenty-one trillion, one billion, three hundred twelve million, two hundred twenty-three thousand, one hundred thirty".