21515423052019 has 64 divisors (see below), whose sum is σ = 24779557490688. Its totient is φ = 18505855641600.

The previous prime is 21515423052017. The next prime is 21515423052029. The reversal of 21515423052019 is 91025032451512.

It is a cyclic number.

It is not a de Polignac number, because 21515423052019 - 2¹ = 21515423052017 is a prime.

It is a super-2 number, since 2×21515423052019² (a number of 27 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21515423052017) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 7261363032 + ... + 7261365994.

It is an arithmetic number, because the mean of its divisors is an integer number (387180585792).

Almost surely, 2^{21515423052019} is an apocalyptic number.

21515423052019 is a deficient number, since it is larger than the sum of its proper divisors (3264134438669).

21515423052019 is a wasteful number, since it uses less digits than its factorization.

21515423052019 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3988.

The product of its (nonzero) digits is 108000, while the sum is 40.

The spelling of 21515423052019 in words is "twenty-one trillion, five hundred fifteen billion, four hundred twenty-three million, fifty-two thousand, nineteen".