21012020020210 has 64 divisors (see below), whose sum is σ = 39163820889600. Its totient is φ = 8107111660032.

The previous prime is 21012020020141. The next prime is 21012020020331. The reversal of 21012020020210 is 1202002021012.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1535173987 + ... + 1535187673.

It is an arithmetic number, because the mean of its divisors is an integer number (611934701400).

Almost surely, 2^{21012020020210} is an apocalyptic number.

21012020020210 is a deficient number, since it is larger than the sum of its proper divisors (18151800869390).

21012020020210 is a wasteful number, since it uses less digits than its factorization.

21012020020210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18475.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 21012020020210 its reverse (1202002021012), we get a palindrome (22214022041222).

The spelling of 21012020020210 in words is "twenty-one trillion, twelve billion, twenty million, twenty thousand, two hundred ten".