21002221021002 has 16 divisors (see below), whose sum is σ = 45235552968480. Its totient is φ = 6462221852592.

The previous prime is 21002221020973. The next prime is 21002221021009. The reversal of 21002221021002 is 20012012220012.

It is not an unprimeable number, because it can be changed into a prime (21002221021009) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 134629621852 + ... + 134629622007.

It is an arithmetic number, because the mean of its divisors is an integer number (2827222060530).

Almost surely, 2^{21002221021002} is an apocalyptic number.

21002221021002 is an abundant number, since it is smaller than the sum of its proper divisors (24233331947478).

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

21002221021002 is a wasteful number, since it uses less digits than its factorization.

21002221021002 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 269259243877.

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21002221021002 its reverse (20012012220012), we get a palindrome (41014233241014).

The spelling of 21002221021002 in words is "twenty-one trillion, two billion, two hundred twenty-one million, twenty-one thousand, two".