21002221214 has 16 divisors (see below), whose sum is σ = 33941194560. Its totient is φ = 9689181600.

The previous prime is 21002221199. The next prime is 21002221223. The reversal of 21002221214 is 41212220012.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21002221192 and 21002221201.

It is a congruent number.

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, 110669 + ... + 232920.

It is an arithmetic number, because the mean of its divisors is an integer number (2121324660).

Almost surely, 2^21002221214 is an apocalyptic number.

21002221214 is a deficient number, since it is larger than the sum of its proper divisors (12938973346).

21002221214 is a wasteful number, since it uses less digits than its factorization.

21002221214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345955.

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21002221214 its reverse (41212220012), we get a palindrome (62214441226).

The spelling of 21002221214 in words is "twenty-one billion, two million, two hundred twenty-one thousand, two hundred fourteen".