215490213940 has 24 divisors (see below), whose sum is σ = 452548212480. Its totient is φ = 86192511648.

The previous prime is 215490213923. The next prime is 215490213959. The reversal of 215490213940 is 49312094512.

It is a junction number, because it is equal to n+sod(n) for n = 215490213893 and 215490213902.

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, 301081 + ... + 722239.

It is an arithmetic number, because the mean of its divisors is an integer number (18856175520).

Almost surely, 2^215490213940 is an apocalyptic number.

215490213940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215490213940 is an abundant number, since it is smaller than the sum of its proper divisors (237057998540).

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

215490213940 is a wasteful number, since it uses less digits than its factorization.

215490213940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 446751 (or 446749 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 40.

The spelling of 215490213940 in words is "two hundred fifteen billion, four hundred ninety million, two hundred thirteen thousand, nine hundred forty".