21243533051 has 6 divisors (see below), whose sum is σ = 23003352540. Its totient is φ = 19609414968.

The previous prime is 21243533041. The next prime is 21243533071. The reversal of 21243533051 is 15033534212.

It is a happy number.

It is not a de Polignac number, because 21243533051 - 2¹⁴ = 21243516667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21243533041) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 62850521 + ... + 62850858.

It is an arithmetic number, because the mean of its divisors is an integer number (3833892090).

Almost surely, 2^21243533051 is an apocalyptic number.

21243533051 is a deficient number, since it is larger than the sum of its proper divisors (1759819489).

21243533051 is a wasteful number, since it uses less digits than its factorization.

21243533051 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125701405 (or 125701392 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 29.

The spelling of 21243533051 in words is "twenty-one billion, two hundred forty-three million, five hundred thirty-three thousand, fifty-one".