21012100210102 has 32 divisors (see below), whose sum is σ = 33726738136320. Its totient is φ = 9788235397920.

The previous prime is 21012100210033. The next prime is 21012100210109. The reversal of 21012100210102 is 20101200121012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012100210109) 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, 12621253 + ... + 14188735.

It is an arithmetic number, because the mean of its divisors is an integer number (1053960566760).

Almost surely, 2^{21012100210102} is an apocalyptic number.

21012100210102 is a deficient number, since it is larger than the sum of its proper divisors (12714637926218).

21012100210102 is a wasteful number, since it uses less digits than its factorization.

21012100210102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1573348.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 21012100210102 its reverse (20101200121012), we get a palindrome (41113300331114).

The spelling of 21012100210102 in words is "twenty-one trillion, twelve billion, one hundred million, two hundred ten thousand, one hundred two".