21011221001010 has 64 divisors (see below), whose sum is σ = 55714664823552. Its totient is φ = 5044126027776.

The previous prime is 21011221000961. The next prime is 21011221001047. The reversal of 21011221001010 is 1010012211012.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 895607239 + ... + 895630698.

It is an arithmetic number, because the mean of its divisors is an integer number (870541637868).

Almost surely, 2^{21011221001010} is an apocalyptic number.

21011221001010 is an abundant number, since it is smaller than the sum of its proper divisors (34703443822542).

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

21011221001010 is a wasteful number, since it uses less digits than its factorization.

21011221001010 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1791237987.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 21011221001010 its reverse (1010012211012), we get a palindrome (22021233212022).

The spelling of 21011221001010 in words is "twenty-one trillion, eleven billion, two hundred twenty-one million, one thousand, ten".