21203724061 has 8 divisors (see below), whose sum is σ = 22962350880. Its totient is φ = 19463321712.

The previous prime is 21203724053. The next prime is 21203724083. The reversal of 21203724061 is 16042730212.

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

It is a cyclic number.

It is not a de Polignac number, because 21203724061 - 2³ = 21203724053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21203724761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4553695 + ... + 4558348.

It is an arithmetic number, because the mean of its divisors is an integer number (2870293860).

Almost surely, 2^21203724061 is an apocalyptic number.

It is an amenable number.

21203724061 is a deficient number, since it is larger than the sum of its proper divisors (1758626819).

21203724061 is a wasteful number, since it uses less digits than its factorization.

21203724061 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9112235.

The product of its (nonzero) digits is 4032, while the sum is 28.

The spelling of 21203724061 in words is "twenty-one billion, two hundred three million, seven hundred twenty-four thousand, sixty-one".