21212210001000 has 128 divisors (see below), whose sum is σ = 67970800834560. Its totient is φ = 5503708512000.

The previous prime is 21212210000987. The next prime is 21212210001097. The reversal of 21212210001000 is 10001221212.

It is a Harshad number since it is a multiple of its sum of digits (12).

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, 95439496 + ... + 95661495.

It is an arithmetic number, because the mean of its divisors is an integer number (531021881520).

Almost surely, 2^{21212210001000} is an apocalyptic number.

21212210001000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21212210001000 is an abundant number, since it is smaller than the sum of its proper divisors (46758590833560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21212210001000 is a wasteful number, since it uses less digits than its factorization.

21212210001000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191101052 (or 191101038 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 12.

Adding to 21212210001000 its reverse (10001221212), we get a palindrome (21222211222212).

The spelling of 21212210001000 in words is "twenty-one trillion, two hundred twelve billion, two hundred ten million, one thousand".