21150402321 has 16 divisors (see below), whose sum is σ = 29896267968. Its totient is φ = 13254451200.

The previous prime is 21150402313. The next prime is 21150402323. The reversal of 21150402321 is 12320405112.

It is not a de Polignac number, because 21150402321 - 2³ = 21150402313 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21150402323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 214320 + ... + 297041.

It is an arithmetic number, because the mean of its divisors is an integer number (1868516748).

Almost surely, 2^21150402321 is an apocalyptic number.

It is an amenable number.

21150402321 is a deficient number, since it is larger than the sum of its proper divisors (8745865647).

21150402321 is a wasteful number, since it uses less digits than its factorization.

21150402321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512192.

The product of its (nonzero) digits is 480, while the sum is 21.

Adding to 21150402321 its reverse (12320405112), we get a palindrome (33470807433).

The spelling of 21150402321 in words is "twenty-one billion, one hundred fifty million, four hundred two thousand, three hundred twenty-one".