21220101212938 has 8 divisors (see below), whose sum is σ = 32606496985860. Its totient is φ = 10351268884320.

The previous prime is 21220101212911. The next prime is 21220101212939. The reversal of 21220101212938 is 83921210102212.

It can be written as a sum of positive squares in 2 ways, for example, as 20820850362169 + 399250850769 = 4562987^2 + 631863^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21220101212939) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 129390860973 + ... + 129390861136.

Almost surely, 2^{21220101212938} is an apocalyptic number.

21220101212938 is a deficient number, since it is larger than the sum of its proper divisors (11386395772922).

21220101212938 is a wasteful number, since it uses less digits than its factorization.

21220101212938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258781722152.

The product of its (nonzero) digits is 6912, while the sum is 34.

The spelling of 21220101212938 in words is "twenty-one trillion, two hundred twenty billion, one hundred one million, two hundred twelve thousand, nine hundred thirty-eight".