21122220999958 has 32 divisors (see below), whose sum is σ = 34701255943200. Its totient is φ = 9582813371136.

The previous prime is 21122220999911. The next prime is 21122220999959. The reversal of 21122220999958 is 85999902222112.

It is a super-4 number, since 4×21122220999958⁴ (a number of 54 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 21122220999896 and 21122220999905.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21122220999959) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21750960 + ... + 22701292.

It is an arithmetic number, because the mean of its divisors is an integer number (1084414248225).

Almost surely, 2^{21122220999958} is an apocalyptic number.

21122220999958 is a deficient number, since it is larger than the sum of its proper divisors (13579034943242).

21122220999958 is a wasteful number, since it uses less digits than its factorization.

21122220999958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 964896.

The product of its (nonzero) digits is 8398080, while the sum is 61.

The spelling of 21122220999958 in words is "twenty-one trillion, one hundred twenty-two billion, two hundred twenty million, nine hundred ninety-nine thousand, nine hundred fifty-eight".