212422440021 has 64 divisors (see below), whose sum is σ = 315266515200. Its totient is φ = 126152294400.

The previous prime is 212422439989. The next prime is 212422440023. The reversal of 212422440021 is 120044224212.

It is a happy number.

It is not a de Polignac number, because 212422440021 - 2⁵ = 212422439989 is a prime.

It is a super-4 number, since 4×212422440021⁴ (a number of 46 digits) contains 4444 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 212422439973 and 212422440000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (212422440023) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 217422685 + ... + 217423661.

It is an arithmetic number, because the mean of its divisors is an integer number (4926039300).

Almost surely, 2^212422440021 is an apocalyptic number.

It is an amenable number.

212422440021 is a deficient number, since it is larger than the sum of its proper divisors (102844075179).

212422440021 is a wasteful number, since it uses less digits than its factorization.

212422440021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1670.

The product of its (nonzero) digits is 2048, while the sum is 24.

Adding to 212422440021 its reverse (120044224212), we get a palindrome (332466664233).

The spelling of 212422440021 in words is "two hundred twelve billion, four hundred twenty-two million, four hundred forty thousand, twenty-one".