21002222010 has 64 divisors (see below), whose sum is σ = 62843019264. Its totient is φ = 4364097600.

The previous prime is 21002222009. The next prime is 21002222011. The reversal of 21002222010 is 1022220012.

It is an interprime number because it is at equal distance from previous prime (21002222009) and next prime (21002222011).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21002222011) 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, 4543626 + ... + 4548245.

It is an arithmetic number, because the mean of its divisors is an integer number (981922176).

Almost surely, 2^21002222010 is an apocalyptic number.

21002222010 is an abundant number, since it is smaller than the sum of its proper divisors (41840797254).

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

21002222010 is a wasteful number, since it uses less digits than its factorization.

21002222010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9091899.

The product of its (nonzero) digits is 32, while the sum is 12.

Adding to 21002222010 its reverse (1022220012), we get a palindrome (22024442022).

The spelling of 21002222010 in words is "twenty-one billion, two million, two hundred twenty-two thousand, ten".