521102121243 has 32 divisors (see below), whose sum is σ = 771499302912. Its totient is φ = 310230144000.

The previous prime is 521102121223. The next prime is 521102121259. The reversal of 521102121243 is 342121201125.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-521102121243 is a prime.

It is not an unprimeable number, because it can be changed into a prime (521102121223) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 192246 + ... + 1038827.

It is an arithmetic number, because the mean of its divisors is an integer number (24109353216).

Almost surely, 2^521102121243 is an apocalyptic number.

521102121243 is a deficient number, since it is larger than the sum of its proper divisors (250397181669).

521102121243 is a wasteful number, since it uses less digits than its factorization.

521102121243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1231315.

The product of its (nonzero) digits is 960, while the sum is 24.

Adding to 521102121243 its reverse (342121201125), we get a palindrome (863223322368).

The spelling of 521102121243 in words is "five hundred twenty-one billion, one hundred two million, one hundred twenty-one thousand, two hundred forty-three".