215220044 has 12 divisors (see below), whose sum is σ = 405607104. Its totient is φ = 99332304.

The previous prime is 215220043. The next prime is 215220053. The reversal of 215220044 is 440022512.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 215219998 and 215220025.

It is not an unprimeable number, because it can be changed into a prime (215220043) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2069372 + ... + 2069475.

It is an arithmetic number, because the mean of its divisors is an integer number (33800592).

Almost surely, 2^215220044 is an apocalyptic number.

It is an amenable number.

215220044 is a deficient number, since it is larger than the sum of its proper divisors (190387060).

215220044 is a wasteful number, since it uses less digits than its factorization.

215220044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4138864 (or 4138862 counting only the distinct ones).

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 215220044 is about 14670.3798178507. The cubic root of 215220044 is about 599.2769475271.

Adding to 215220044 its reverse (440022512), we get a palindrome (655242556).

The spelling of 215220044 in words is "two hundred fifteen million, two hundred twenty thousand, forty-four".