2123015531 has 16 divisors (see below), whose sum is σ = 2617535424. Its totient is φ = 1676795904.

The previous prime is 2123015509. The next prime is 2123015549. The reversal of 2123015531 is 1355103212.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-2123015531 is a prime.

It is a super-3 number, since 3×2123015531³ (a number of 29 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a junction number, because it is equal to n+sod(n) for n = 2123015497 and 2123015506.

It is not an unprimeable number, because it can be changed into a prime (2123015551) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32291 + ... + 72723.

It is an arithmetic number, because the mean of its divisors is an integer number (163595964).

Almost surely, 2^2123015531 is an apocalyptic number.

2123015531 is a deficient number, since it is larger than the sum of its proper divisors (494519893).

2123015531 is a wasteful number, since it uses less digits than its factorization.

2123015531 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41030.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 2123015531 is about 46076.1926704019. The cubic root of 2123015531 is about 1285.2404645193.

Adding to 2123015531 its reverse (1355103212), we get a palindrome (3478118743).

The spelling of 2123015531 in words is "two billion, one hundred twenty-three million, fifteen thousand, five hundred thirty-one".