21021301012 has 24 divisors (see below), whose sum is σ = 37412023880. Its totient is φ = 10332351360.

The previous prime is 21021300991. The next prime is 21021301033. The reversal of 21021301012 is 21010312012.

It is an interprime number because it is at equal distance from previous prime (21021300991) and next prime (21021301033).

It can be written as a sum of positive squares in 4 ways, for example, as 8594402436 + 12426898576 = 92706^2 + 111476^2 .

It is a super-2 number, since 2×21021301012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21021300983 and 21021301001.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 412438 + ... + 460594.

Almost surely, 2^21021301012 is an apocalyptic number.

It is an amenable number.

21021301012 is a deficient number, since it is larger than the sum of its proper divisors (16390722868).

21021301012 is a wasteful number, since it uses less digits than its factorization.

21021301012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50011 (or 50009 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21021301012 its reverse (21010312012), we get a palindrome (42031613024).

The spelling of 21021301012 in words is "twenty-one billion, twenty-one million, three hundred one thousand, twelve".