21515010135043 has 4 divisors (see below), whose sum is σ = 21626486871688. Its totient is φ = 21403533398400.

The previous prime is 21515010135029. The next prime is 21515010135053. The reversal of 21515010135043 is 34053101051512.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21515010135043 - 2¹³ = 21515010126851 is a prime.

It is a super-2 number, since 2×21515010135043² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21515010134996 and 21515010135014.

It is not an unprimeable number, because it can be changed into a prime (21515010135053) 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, 55738368033 + ... + 55738368418.

It is an arithmetic number, because the mean of its divisors is an integer number (5406621717922).

Almost surely, 2^{21515010135043} is an apocalyptic number.

21515010135043 is a deficient number, since it is larger than the sum of its proper divisors (111476736645).

21515010135043 is a wasteful number, since it uses less digits than its factorization.

21515010135043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111476736644.

The product of its (nonzero) digits is 9000, while the sum is 31.

Adding to 21515010135043 its reverse (34053101051512), we get a palindrome (55568111186555).

The spelling of 21515010135043 in words is "twenty-one trillion, five hundred fifteen billion, ten million, one hundred thirty-five thousand, forty-three".