21220121021102 has 32 divisors (see below), whose sum is σ = 33719198078592. Its totient is φ = 9981006188544.

The previous prime is 21220121021083. The next prime is 21220121021107. The reversal of 21220121021102 is 20112012102212.

It is a Harshad number since it is a multiple of its sum of digits (17).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21220121021107) 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, 1053463643 + ... + 1053483785.

It is an arithmetic number, because the mean of its divisors is an integer number (1053724939956).

Almost surely, 2^{21220121021102} is an apocalyptic number.

21220121021102 is a deficient number, since it is larger than the sum of its proper divisors (12499077057490).

21220121021102 is a wasteful number, since it uses less digits than its factorization.

21220121021102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33932.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21220121021102 its reverse (20112012102212), we get a palindrome (41332133123314).

The spelling of 21220121021102 in words is "twenty-one trillion, two hundred twenty billion, one hundred twenty-one million, twenty-one thousand, one hundred two".