21215444451212 has 24 divisors (see below), whose sum is σ = 40567855965840. Its totient is φ = 9627754357760.

The previous prime is 21215444451181. The next prime is 21215444451221.

21215444451212 is nontrivially palindromic in base 10.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 390709637 + ... + 390763932.

It is an arithmetic number, because the mean of its divisors is an integer number (1690327331910).

Almost surely, 2^{21215444451212} is an apocalyptic number.

21215444451212 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

21215444451212 is a deficient number, since it is larger than the sum of its proper divisors (19352411514628).

21215444451212 is a wasteful number, since it uses less digits than its factorization.

21215444451212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 781474201 (or 781474199 counting only the distinct ones).

The product of its digits is 102400, while the sum is 38.

It can be divided in two parts, 2121544 and 4451212, that added together give a palindrome (6572756).

The spelling of 21215444451212 in words is "twenty-one trillion, two hundred fifteen billion, four hundred forty-four million, four hundred fifty-one thousand, two hundred twelve".