21010221121012 has 6 divisors (see below), whose sum is σ = 36767886961778. Its totient is φ = 10505110560504.

The previous prime is 21010221120983. The next prime is 21010221121013. The reversal of 21010221121012 is 21012112201012.

It can be written as a sum of positive squares in only one way, i.e., 19400377831396 + 1609843289616 = 4404586^2 + 1268796^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21010221121013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2626277640123 + ... + 2626277640130.

Almost surely, 2^{21010221121012} is an apocalyptic number.

It is an amenable number.

21010221121012 is a deficient number, since it is larger than the sum of its proper divisors (15757665840766).

21010221121012 is a wasteful number, since it uses less digits than its factorization.

21010221121012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5252555280257 (or 5252555280255 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 21010221121012 its reverse (21012112201012), we get a palindrome (42022333322024).

The spelling of 21010221121012 in words is "twenty-one trillion, ten billion, two hundred twenty-one million, one hundred twenty-one thousand, twelve".