21021000010 has 8 divisors (see below), whose sum is σ = 37837800036. Its totient is φ = 8408400000.

The previous prime is 21020999981. The next prime is 21021000017. The reversal of 21021000010 is 1000012012.

It can be written as a sum of positive squares in 2 ways, for example, as 20874759361 + 146240649 = 144481^2 + 12093^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 21020999957 and 21021000002.

It is not an unprimeable number, because it can be changed into a prime (21021000017) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051049991 + ... + 1051050010.

Almost surely, 2^21021000010 is an apocalyptic number.

21021000010 is a deficient number, since it is larger than the sum of its proper divisors (16816800026).

21021000010 is a wasteful number, since it uses less digits than its factorization.

21021000010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2102100008.

The product of its (nonzero) digits is 4, while the sum is 7.

Adding to 21021000010 its reverse (1000012012), we get a palindrome (22021012022).

The spelling of 21021000010 in words is "twenty-one billion, twenty-one million, ten", and thus it is an aban number and an uban number.