21100121002 has 8 divisors (see below), whose sum is σ = 31651863012. Its totient is φ = 10549500000.

The previous prime is 21100120973. The next prime is 21100121033. The reversal of 21100121002 is 20012100112.

It can be written as a sum of positive squares in 2 ways, for example, as 19886922441 + 1213198561 = 141021^2 + 34831^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 21100121002.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 231499 + ... + 309502.

Almost surely, 2^21100121002 is an apocalyptic number.

21100121002 is a deficient number, since it is larger than the sum of its proper divisors (10551742010).

21100121002 is a wasteful number, since it uses less digits than its factorization.

21100121002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 560504.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 21100121002 its reverse (20012100112), we get a palindrome (41112221114).

The spelling of 21100121002 in words is "twenty-one billion, one hundred million, one hundred twenty-one thousand, two".