21001012010 has 32 divisors (see below), whose sum is σ = 41261864832. Its totient is φ = 7632377280.

The previous prime is 21001012007. The next prime is 21001012049. The reversal of 21001012010 is 1021010012.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 142592 + ... + 249668.

It is an arithmetic number, because the mean of its divisors is an integer number (1289433276).

Almost surely, 2^21001012010 is an apocalyptic number.

21001012010 is a deficient number, since it is larger than the sum of its proper divisors (20260852822).

21001012010 is a wasteful number, since it uses less digits than its factorization.

21001012010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108878.

The product of its (nonzero) digits is 4, while the sum is 8.

Adding to 21001012010 its reverse (1021010012), we get a palindrome (22022022022).

The spelling of 21001012010 in words is "twenty-one billion, one million, twelve thousand, ten".