21001000212010 has 32 divisors (see below), whose sum is σ = 46525292779392. Its totient is φ = 6646470396480.

The previous prime is 21001000211963. The next prime is 21001000212011. The reversal of 21001000212010 is 1021200010012.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (21001000212011) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11539010196 + ... + 11539012015.

It is an arithmetic number, because the mean of its divisors is an integer number (1453915399356).

Almost surely, 2^{21001000212010} is an apocalyptic number.

21001000212010 is an abundant number, since it is smaller than the sum of its proper divisors (25524292567382).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21001000212010 is a wasteful number, since it uses less digits than its factorization.

21001000212010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23078022238.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21001000212010 its reverse (1021200010012), we get a palindrome (22022200222022).

The spelling of 21001000212010 in words is "twenty-one trillion, one billion, two hundred twelve thousand, ten".