211221434040 has 32 divisors (see below), whose sum is σ = 633664302480. Its totient is φ = 56325715712.

The previous prime is 211221434023. The next prime is 211221434051. The reversal of 211221434040 is 40434122112.

It is a super-2 number, since 2×211221434040² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 211221434040.

It is a congruent number.

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, 880089189 + ... + 880089428.

Almost surely, 2^211221434040 is an apocalyptic number.

211221434040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211221434040 is an abundant number, since it is smaller than the sum of its proper divisors (422442868440).

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

211221434040 is a wasteful number, since it uses less digits than its factorization.

211221434040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1760178631 (or 1760178627 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 24.

Adding to 211221434040 its reverse (40434122112), we get a palindrome (251655556152).

The spelling of 211221434040 in words is "two hundred eleven billion, two hundred twenty-one million, four hundred thirty-four thousand, forty".