21000120212110 has 16 divisors (see below), whose sum is σ = 40707925334496. Its totient is φ = 7753890539808.

The previous prime is 21000120212089. The next prime is 21000120212111. The reversal of 21000120212110 is 1121202100012.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000120212111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80769692994 + ... + 80769693253.

It is an arithmetic number, because the mean of its divisors is an integer number (2544245333406).

Almost surely, 2^{21000120212110} is an apocalyptic number.

21000120212110 is a deficient number, since it is larger than the sum of its proper divisors (19707805122386).

21000120212110 is a wasteful number, since it uses less digits than its factorization.

21000120212110 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161539386267.

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

Adding to 21000120212110 its reverse (1121202100012), we get a palindrome (22121322312122).

The spelling of 21000120212110 in words is "twenty-one trillion, one hundred twenty million, two hundred twelve thousand, one hundred ten".