21012202121210 has 64 divisors (see below), whose sum is σ = 39598716844800. Its totient is φ = 8012505346560.

The previous prime is 21012202121203. The next prime is 21012202121353. The reversal of 21012202121210 is 1212120221012.

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, 548616641 + ... + 548654939.

It is an arithmetic number, because the mean of its divisors is an integer number (618729950700).

Almost surely, 2^{21012202121210} is an apocalyptic number.

21012202121210 is a deficient number, since it is larger than the sum of its proper divisors (18586514723590).

21012202121210 is a wasteful number, since it uses less digits than its factorization.

21012202121210 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46263.

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

Adding to 21012202121210 its reverse (1212120221012), we get a palindrome (22224322342222).

The spelling of 21012202121210 in words is "twenty-one trillion, twelve billion, two hundred two million, one hundred twenty-one thousand, two hundred ten".