21021213010 has 32 divisors (see below), whose sum is σ = 43432508160. Its totient is φ = 7175794752.

The previous prime is 21021213001. The next prime is 21021213013. The reversal of 21021213010 is 1031212012.

It is a super-3 number, since 3×21021213010³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (21021213013) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 639654 + ... + 671713.

It is an arithmetic number, because the mean of its divisors is an integer number (1357265880).

Almost surely, 2^21021213010 is an apocalyptic number.

21021213010 is an abundant number, since it is smaller than the sum of its proper divisors (22411295150).

21021213010 is a wasteful number, since it uses less digits than its factorization.

21021213010 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1311610.

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

Adding to 21021213010 its reverse (1031212012), we get a palindrome (22052425022).

The spelling of 21021213010 in words is "twenty-one billion, twenty-one million, two hundred thirteen thousand, ten".