21121010210102 has 32 divisors (see below), whose sum is σ = 35115683998464. Its totient is φ = 9447750108000.

The previous prime is 21121010210077. The next prime is 21121010210107. The reversal of 21121010210102 is 20101201012112.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21121010210107) 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, 29354453 + ... + 30065360.

It is an arithmetic number, because the mean of its divisors is an integer number (1097365124952).

Almost surely, 2^{21121010210102} is an apocalyptic number.

21121010210102 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21121010210102 is a deficient number, since it is larger than the sum of its proper divisors (13994673788362).

21121010210102 is a wasteful number, since it uses less digits than its factorization.

21121010210102 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59420084.

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

Adding to 21121010210102 its reverse (20101201012112), we get a palindrome (41222211222214).

The spelling of 21121010210102 in words is "twenty-one trillion, one hundred twenty-one billion, ten million, two hundred ten thousand, one hundred two".