21001020010 has 8 divisors (see below), whose sum is σ = 37801836036. Its totient is φ = 8400408000.

The previous prime is 21001019983. The next prime is 21001020059. The reversal of 21001020010 is 1002010012.

It can be written as a sum of positive squares in 2 ways, for example, as 18088367049 + 2912652961 = 134493^2 + 53969^2 .

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 = 21001019975 and 21001020002.

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, 1050050991 + ... + 1050051010.

Almost surely, 2^21001020010 is an apocalyptic number.

21001020010 is a deficient number, since it is larger than the sum of its proper divisors (16800816026).

21001020010 is a wasteful number, since it uses less digits than its factorization.

21001020010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2100102008.

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

Adding to 21001020010 its reverse (1002010012), we get a palindrome (22003030022).

The spelling of 21001020010 in words is "twenty-one billion, one million, twenty thousand, ten".