21051232342534 has 8 divisors (see below), whose sum is σ = 31576872811608. Its totient is φ = 10525608072000.

The previous prime is 21051232342531. The next prime is 21051232342541. The reversal of 21051232342534 is 43524323215012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×21051232342534² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21051232342493 and 21051232342502.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21051232342531) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15409 + ... + 6488659.

It is an arithmetic number, because the mean of its divisors is an integer number (3947109101451).

Almost surely, 2^{21051232342534} is an apocalyptic number.

21051232342534 is a deficient number, since it is larger than the sum of its proper divisors (10525640469074).

21051232342534 is a wasteful number, since it uses less digits than its factorization.

21051232342534 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8099270.

The product of its (nonzero) digits is 172800, while the sum is 37.

Adding to 21051232342534 its reverse (43524323215012), we get a palindrome (64575555557546).

The spelling of 21051232342534 in words is "twenty-one trillion, fifty-one billion, two hundred thirty-two million, three hundred forty-two thousand, five hundred thirty-four".