21221221023102 has 64 divisors (see below), whose sum is σ = 45229759223040. Its totient is φ = 6614579252736.

The previous prime is 21221221023083. The next prime is 21221221023109. The reversal of 21221221023102 is 20132012212212.

It is a super-2 number, since 2×21221221023102² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221221023109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 177038913 + ... + 177158739.

It is an arithmetic number, because the mean of its divisors is an integer number (706714987860).

Almost surely, 2^{21221221023102} is an apocalyptic number.

21221221023102 is an abundant number, since it is smaller than the sum of its proper divisors (24008538199938).

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

21221221023102 is a wasteful number, since it uses less digits than its factorization.

21221221023102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 131065.

The product of its (nonzero) digits is 384, while the sum is 21.

Adding to 21221221023102 its reverse (20132012212212), we get a palindrome (41353233235314).

The spelling of 21221221023102 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred twenty-one million, twenty-three thousand, one hundred two".