21021213100210 has 16 divisors (see below), whose sum is σ = 37901991657816. Its totient is φ = 8394305667328.

The previous prime is 21021213100201. The next prime is 21021213100211. The reversal of 21021213100210 is 1200131212012.

It can be written as a sum of positive squares in 4 ways, for example, as 18413204505721 + 2608008594489 = 4291061^2 + 1614933^2 .

It is not an unprimeable number, because it can be changed into a prime (21021213100211) 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, 1772440369 + ... + 1772452228.

Almost surely, 2^{21021213100210} is an apocalyptic number.

21021213100210 is a deficient number, since it is larger than the sum of its proper divisors (16880778557606).

21021213100210 is a wasteful number, since it uses less digits than its factorization.

21021213100210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3544893197.

The product of its (nonzero) digits is 48, while the sum is 16.

Adding to 21021213100210 its reverse (1200131212012), we get a palindrome (22221344312222).

The spelling of 21021213100210 in words is "twenty-one trillion, twenty-one billion, two hundred thirteen million, one hundred thousand, two hundred ten".