20150221004 has 6 divisors (see below), whose sum is σ = 35262886764. Its totient is φ = 10075110500.

The previous prime is 20150220991. The next prime is 20150221019. The reversal of 20150221004 is 40012205102.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2518777622 + ... + 2518777629.

It is an arithmetic number, because the mean of its divisors is an integer number (5877147794).

Almost surely, 2^20150221004 is an apocalyptic number.

It is an amenable number.

20150221004 is a deficient number, since it is larger than the sum of its proper divisors (15112665760).

20150221004 is a wasteful number, since it uses less digits than its factorization.

20150221004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5037555255 (or 5037555253 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 17.

Adding to 20150221004 its reverse (40012205102), we get a palindrome (60162426106).

The spelling of 20150221004 in words is "twenty billion, one hundred fifty million, two hundred twenty-one thousand, four".