21000021212010 has 16 divisors (see below), whose sum is σ = 50400050908896. Its totient is φ = 5600005656528.

The previous prime is 21000021211973. The next prime is 21000021212101. The reversal of 21000021212010 is 1021212000012.

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, 350000353504 + ... + 350000353563.

It is an arithmetic number, because the mean of its divisors is an integer number (3150003181806).

Almost surely, 2^{21000021212010} is an apocalyptic number.

21000021212010 is an abundant number, since it is smaller than the sum of its proper divisors (29400029696886).

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

21000021212010 is a wasteful number, since it uses less digits than its factorization.

21000021212010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 700000707077.

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21000021212010 its reverse (1021212000012), we get a palindrome (22021233212022).

The spelling of 21000021212010 in words is "twenty-one trillion, twenty-one million, two hundred twelve thousand, ten".