21312110021050 has 48 divisors (see below), whose sum is σ = 41974345757880. Its totient is φ = 8022995394560.

The previous prime is 21312110021047. The next prime is 21312110021051. The reversal of 21312110021050 is 5012001121312.

It can be written as a sum of positive squares in 12 ways, for example, as 3848160958929 + 17463949062121 = 1961673^2 + 4178989^2 .

It is not an unprimeable number, because it can be changed into a prime (21312110021051) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 17331192 + ... + 18520108.

Almost surely, 2^{21312110021050} is an apocalyptic number.

21312110021050 is a deficient number, since it is larger than the sum of its proper divisors (20662235736830).

21312110021050 is a wasteful number, since it uses less digits than its factorization.

21312110021050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1210035 (or 1210030 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 21312110021050 its reverse (5012001121312), we get a palindrome (26324111142362).

The spelling of 21312110021050 in words is "twenty-one trillion, three hundred twelve billion, one hundred ten million, twenty-one thousand, fifty".