21213404534446 has 8 divisors (see below), whose sum is σ = 32203481582664. Its totient is φ = 10478910673560.

The previous prime is 21213404534431. The next prime is 21213404534461. The reversal of 21213404534446 is 64443540431212.

It is an interprime number because it is at equal distance from previous prime (21213404534431) and next prime (21213404534461).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21213404534446² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63895796625 + ... + 63895796956.

It is an arithmetic number, because the mean of its divisors is an integer number (4025435197833).

Almost surely, 2^{21213404534446} is an apocalyptic number.

21213404534446 is a deficient number, since it is larger than the sum of its proper divisors (10990077048218).

21213404534446 is a wasteful number, since it uses less digits than its factorization.

21213404534446 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127791593666.

The product of its (nonzero) digits is 1105920, while the sum is 43.

Adding to 21213404534446 its reverse (64443540431212), we get a palindrome (85656944965658).

The spelling of 21213404534446 in words is "twenty-one trillion, two hundred thirteen billion, four hundred four million, five hundred thirty-four thousand, four hundred forty-six".