21221202121008 has 160 divisors (see below), whose sum is σ = 55170068889600. Its totient is φ = 7028944876800.

The previous prime is 21221202121001. The next prime is 21221202121033. The reversal of 21221202121008 is 80012120212212.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is not an unprimeable number, because it can be changed into a prime (21221202121001) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6078830143 + ... + 6078833633.

It is an arithmetic number, because the mean of its divisors is an integer number (344812930560).

Almost surely, 2^{21221202121008} is an apocalyptic number.

It is an amenable number.

21221202121008 is an abundant number, since it is smaller than the sum of its proper divisors (33948866768592).

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

21221202121008 is a wasteful number, since it uses less digits than its factorization.

21221202121008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5031 (or 5025 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 24.

The spelling of 21221202121008 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred two million, one hundred twenty-one thousand, eight".