211551552440 has 32 divisors (see below), whose sum is σ = 476731316880. Its totient is φ = 84489007872.

The previous prime is 211551552431. The next prime is 211551552449. The reversal of 211551552440 is 44255155112.

It is an interprime number because it is at equal distance from previous prime (211551552431) and next prime (211551552449).

It is a self number, because there is not a number n which added to its sum of digits gives 211551552440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211551552449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4086869 + ... + 4138308.

Almost surely, 2^211551552440 is an apocalyptic number.

211551552440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

211551552440 is an abundant number, since it is smaller than the sum of its proper divisors (265179764440).

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

211551552440 is a wasteful number, since it uses less digits than its factorization.

211551552440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8225831 (or 8225827 counting only the distinct ones).

The product of its (nonzero) digits is 40000, while the sum is 35.

The spelling of 211551552440 in words is "two hundred eleven billion, five hundred fifty-one million, five hundred fifty-two thousand, four hundred forty".