211212421040 has 40 divisors (see below), whose sum is σ = 491661396240. Its totient is φ = 84383030016.

The previous prime is 211212421033. The next prime is 211212421087. The reversal of 211212421040 is 40124212112.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×211212421040² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1526054 + ... + 1658693.

It is an arithmetic number, because the mean of its divisors is an integer number (12291534906).

Almost surely, 2^211212421040 is an apocalyptic number.

211212421040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211212421040 is an abundant number, since it is smaller than the sum of its proper divisors (280448975200).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211212421040 is a wasteful number, since it uses less digits than its factorization.

211212421040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3185589 (or 3185583 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 20.

Adding to 211212421040 its reverse (40124212112), we get a palindrome (251336633152).

The spelling of 211212421040 in words is "two hundred eleven billion, two hundred twelve million, four hundred twenty-one thousand, forty".