20150121230 has 32 divisors (see below), whose sum is σ = 36659026656. Its totient is φ = 7973852544.

The previous prime is 20150121217. The next prime is 20150121259. The reversal of 20150121230 is 3212105102.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 20150121199 and 20150121208.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 797552 + ... + 822428.

It is an arithmetic number, because the mean of its divisors is an integer number (1145594583).

Almost surely, 2^20150121230 is an apocalyptic number.

20150121230 is a deficient number, since it is larger than the sum of its proper divisors (16508905426).

20150121230 is a wasteful number, since it uses less digits than its factorization.

20150121230 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25748.

The product of its (nonzero) digits is 120, while the sum is 17.

Adding to 20150121230 its reverse (3212105102), we get a palindrome (23362226332).

The spelling of 20150121230 in words is "twenty billion, one hundred fifty million, one hundred twenty-one thousand, two hundred thirty".