21012000020102 has 32 divisors (see below), whose sum is σ = 38791684755264. Its totient is φ = 8312375260800.

The previous prime is 21012000020093. The next prime is 21012000020107. The reversal of 21012000020102 is 20102000021012.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21012000020107) 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, 28165952 + ... + 28902332.

It is an arithmetic number, because the mean of its divisors is an integer number (1212240148602).

Almost surely, 2^{21012000020102} is an apocalyptic number.

21012000020102 is a deficient number, since it is larger than the sum of its proper divisors (17779684735162).

21012000020102 is a wasteful number, since it uses less digits than its factorization.

21012000020102 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893184.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 21012000020102 its reverse (20102000021012), we get a palindrome (41114000041114).

The spelling of 21012000020102 in words is "twenty-one trillion, twelve billion, twenty thousand, one hundred two".