21121101020986 has 8 divisors (see below), whose sum is σ = 31681862078580. Its totient is φ = 10560480328128.

The previous prime is 21121101020983. The next prime is 21121101021043. The reversal of 21121101020986 is 68902010112112.

It can be written as a sum of positive squares in 2 ways, for example, as 21060618964225 + 60482056761 = 4589185^2 + 245931^2 .

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

It is a super-2 number, since 2×21121101020986² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21121101020983) 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, 34714191 + ... + 35317378.

Almost surely, 2^{21121101020986} is an apocalyptic number.

21121101020986 is a deficient number, since it is larger than the sum of its proper divisors (10560761057594).

21121101020986 is a wasteful number, since it uses less digits than its factorization.

21121101020986 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70182368.

The product of its (nonzero) digits is 3456, while the sum is 34.

The spelling of 21121101020986 in words is "twenty-one trillion, one hundred twenty-one billion, one hundred one million, twenty thousand, nine hundred eighty-six".