21152201450 has 24 divisors (see below), whose sum is σ = 39347005068. Its totient is φ = 8460039680.

The previous prime is 21152201401. The next prime is 21152201467. The reversal of 21152201450 is 5410225112.

It can be written as a sum of positive squares in 6 ways, for example, as 5974207849 + 15177993601 = 77293^2 + 123199^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 820964 + ... + 846336.

Almost surely, 2^21152201450 is an apocalyptic number.

21152201450 is a deficient number, since it is larger than the sum of its proper divisors (18194803618).

21152201450 is a wasteful number, since it uses less digits than its factorization.

21152201450 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42058 (or 42053 counting only the distinct ones).

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

Adding to 21152201450 its reverse (5410225112), we get a palindrome (26562426562).

The spelling of 21152201450 in words is "twenty-one billion, one hundred fifty-two million, two hundred one thousand, four hundred fifty".