21001200010 has 16 divisors (see below), whose sum is σ = 43202468736. Its totient is φ = 7200411408.

The previous prime is 21001200001. The next prime is 21001200041. The reversal of 21001200010 is 1000210012.

It is a Harshad number since it is a multiple of its sum of digits (7).

It is a junction number, because it is equal to n+sod(n) for n = 21001199966 and 21001200002.

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, 150008502 + ... + 150008641.

It is an arithmetic number, because the mean of its divisors is an integer number (2700154296).

Almost surely, 2^21001200010 is an apocalyptic number.

21001200010 is an abundant number, since it is smaller than the sum of its proper divisors (22201268726).

21001200010 is a wasteful number, since it uses less digits than its factorization.

21001200010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 300017157.

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

Adding to 21001200010 its reverse (1000210012), we get a palindrome (22001410022).

The spelling of 21001200010 in words is "twenty-one billion, one million, two hundred thousand, ten".