21021301210 has 128 divisors (see below), whose sum is σ = 50458028544. Its totient is φ = 6115737600.

The previous prime is 21021301199. The next prime is 21021301229. The reversal of 21021301210 is 1210312012.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 649410 + ... + 681010.

It is an arithmetic number, because the mean of its divisors is an integer number (394203348).

Almost surely, 2^21021301210 is an apocalyptic number.

21021301210 is an abundant number, since it is smaller than the sum of its proper divisors (29436727334).

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

21021301210 is a wasteful number, since it uses less digits than its factorization.

21021301210 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31688.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 21021301210 its reverse (1210312012), we get a palindrome (22231613222).

The spelling of 21021301210 in words is "twenty-one billion, twenty-one million, three hundred one thousand, two hundred ten".