21213602221534 has 64 divisors (see below), whose sum is σ = 33312903436800. Its totient is φ = 10121253436800.

The previous prime is 21213602221529. The next prime is 21213602221547. The reversal of 21213602221534 is 43512220631212.

It is a self number, because there is not a number n which added to its sum of digits gives 21213602221534.

It is a congruent 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, 4533787407 + ... + 4533792085.

It is an arithmetic number, because the mean of its divisors is an integer number (520514116200).

Almost surely, 2^{21213602221534} is an apocalyptic number.

21213602221534 is a deficient number, since it is larger than the sum of its proper divisors (12099301215266).

21213602221534 is a wasteful number, since it uses less digits than its factorization.

21213602221534 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7009.

The product of its (nonzero) digits is 34560, while the sum is 34.

Adding to 21213602221534 its reverse (43512220631212), we get a palindrome (64725822852746).

The spelling of 21213602221534 in words is "twenty-one trillion, two hundred thirteen billion, six hundred two million, two hundred twenty-one thousand, five hundred thirty-four".