21050153354 has 4 divisors (see below), whose sum is σ = 31575230034. Its totient is φ = 10525076676.

The previous prime is 21050153347. The next prime is 21050153387. The reversal of 21050153354 is 45335105012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 15912561025 + 5137592329 = 126145^2 + 71677^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5262538337 + ... + 5262538340.

Almost surely, 2^21050153354 is an apocalyptic number.

21050153354 is a deficient number, since it is larger than the sum of its proper divisors (10525076680).

21050153354 is a wasteful number, since it uses less digits than its factorization.

21050153354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10525076679.

The product of its (nonzero) digits is 9000, while the sum is 29.

Adding to 21050153354 its reverse (45335105012), we get a palindrome (66385258366).

The spelling of 21050153354 in words is "twenty-one billion, fifty million, one hundred fifty-three thousand, three hundred fifty-four".