21201015254 has 8 divisors (see below), whose sum is σ = 31979185560. Its totient is φ = 10541286736.

The previous prime is 21201015211. The next prime is 21201015263. The reversal of 21201015254 is 45251010212.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 29609999 + ... + 29610714.

It is an arithmetic number, because the mean of its divisors is an integer number (3997398195).

Almost surely, 2^21201015254 is an apocalyptic number.

21201015254 is a deficient number, since it is larger than the sum of its proper divisors (10778170306).

21201015254 is a wasteful number, since it uses less digits than its factorization.

21201015254 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59220894.

The product of its (nonzero) digits is 800, while the sum is 23.

Adding to 21201015254 its reverse (45251010212), we get a palindrome (66452025466).

The spelling of 21201015254 in words is "twenty-one billion, two hundred one million, fifteen thousand, two hundred fifty-four".