21012100212122 has 16 divisors (see below), whose sum is σ = 32608307020032. Its totient is φ = 10144194584160.

The previous prime is 21012100212121. The next prime is 21012100212137. The reversal of 21012100212122 is 22121200121012.

It is a self number, because there is not a number n which added to its sum of digits gives 21012100212122.

It is not an unprimeable number, because it can be changed into a prime (21012100212121) 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, 382483643 + ... + 382538574.

It is an arithmetic number, because the mean of its divisors is an integer number (2038019188752).

Almost surely, 2^{21012100212122} is an apocalyptic number.

21012100212122 is a deficient number, since it is larger than the sum of its proper divisors (11596206807910).

21012100212122 is a wasteful number, since it uses less digits than its factorization.

21012100212122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765022693.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 21012100212122 its reverse (22121200121012), we get a palindrome (43133300333134).

The spelling of 21012100212122 in words is "twenty-one trillion, twelve billion, one hundred million, two hundred twelve thousand, one hundred twenty-two".