21000121112210 has 16 divisors (see below), whose sum is σ = 38174477587992. Its totient is φ = 8316879648000.

The previous prime is 21000121112209. The next prime is 21000121112219. The reversal of 21000121112210 is 1221112100012.

It can be written as a sum of positive squares in 4 ways, for example, as 20592835912489 + 407285199721 = 4537933^2 + 638189^2 .

It is a super-2 number, since 2×21000121112210² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21000121112219) 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, 10396098551 + ... + 10396100570.

Almost surely, 2^{21000121112210} is an apocalyptic number.

21000121112210 is a deficient number, since it is larger than the sum of its proper divisors (17174356475782).

21000121112210 is a wasteful number, since it uses less digits than its factorization.

21000121112210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20792199229.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21000121112210 its reverse (1221112100012), we get a palindrome (22221233212222).

The spelling of 21000121112210 in words is "twenty-one trillion, one hundred twenty-one million, one hundred twelve thousand, two hundred ten".