21210220100012 has 6 divisors (see below), whose sum is σ = 37117885175028. Its totient is φ = 10605110050004.

The previous prime is 21210220100009. The next prime is 21210220100021. The reversal of 21210220100012 is 21000102201212.

It is a self number, because there is not a number n which added to its sum of digits gives 21210220100012.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2651277512498 + ... + 2651277512505.

It is an arithmetic number, because the mean of its divisors is an integer number (6186314195838).

Almost surely, 2^{21210220100012} is an apocalyptic number.

It is an amenable number.

21210220100012 is a deficient number, since it is larger than the sum of its proper divisors (15907665075016).

21210220100012 is a wasteful number, since it uses less digits than its factorization.

21210220100012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5302555025007 (or 5302555025005 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 21210220100012 its reverse (21000102201212), we get a palindrome (42210322301224).

The spelling of 21210220100012 in words is "twenty-one trillion, two hundred ten billion, two hundred twenty million, one hundred thousand, twelve".