21020001010 has 8 divisors (see below), whose sum is σ = 37836001836. Its totient is φ = 8408000400.

The previous prime is 21020000927. The next prime is 21020001071. The reversal of 21020001010 is 1010002012.

It can be written as a sum of positive squares in 2 ways, for example, as 18231210529 + 2788790481 = 135023^2 + 52809^2 .

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 = 21020000984 and 21020001002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1051000041 + ... + 1051000060.

Almost surely, 2^21020001010 is an apocalyptic number.

21020001010 is a deficient number, since it is larger than the sum of its proper divisors (16816000826).

21020001010 is a wasteful number, since it uses less digits than its factorization.

21020001010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2102000108.

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

Adding to 21020001010 its reverse (1010002012), we get a palindrome (22030003022).

The spelling of 21020001010 in words is "twenty-one billion, twenty million, one thousand, ten".