21512423050342 has 32 divisors (see below), whose sum is σ = 36894649559040. Its totient is φ = 9215558019360.

The previous prime is 21512423050333. The next prime is 21512423050361. The reversal of 21512423050342 is 24305032421512.

It is a junction number, because it is equal to n+sod(n) for n = 21512423050298 and 21512423050307.

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, 576582784 + ... + 576620092.

It is an arithmetic number, because the mean of its divisors is an integer number (1152957798720).

Almost surely, 2^{21512423050342} is an apocalyptic number.

21512423050342 is a deficient number, since it is larger than the sum of its proper divisors (15382226508698).

21512423050342 is a wasteful number, since it uses less digits than its factorization.

21512423050342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54316.

The product of its (nonzero) digits is 57600, while the sum is 34.

Adding to 21512423050342 its reverse (24305032421512), we get a palindrome (45817455471854).

The spelling of 21512423050342 in words is "twenty-one trillion, five hundred twelve billion, four hundred twenty-three million, fifty thousand, three hundred forty-two".