21121021110102 has 16 divisors (see below), whose sum is σ = 42286932818352. Its totient is φ = 7032858603680.

The previous prime is 21121021110071. The next prime is 21121021110113. The reversal of 21121021110102 is 20101112012112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1870435473 + ... + 1870446764.

It is an arithmetic number, because the mean of its divisors is an integer number (2642933301147).

Almost surely, 2^{21121021110102} is an apocalyptic number.

21121021110102 is an abundant number, since it is smaller than the sum of its proper divisors (21165911708250).

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

21121021110102 is a wasteful number, since it uses less digits than its factorization.

21121021110102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3740883183.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21121021110102 its reverse (20101112012112), we get a palindrome (41222133122214).

The spelling of 21121021110102 in words is "twenty-one trillion, one hundred twenty-one billion, twenty-one million, one hundred ten thousand, one hundred two".