21152421350 has 24 divisors (see below), whose sum is σ = 39817529640. Its totient is φ = 8359027520.

The previous prime is 21152421349. The next prime is 21152421383. The reversal of 21152421350 is 5312425112.

It is a congruent 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, 2544335 + ... + 2552634.

It is an arithmetic number, because the mean of its divisors is an integer number (1659063735).

Almost surely, 2^21152421350 is an apocalyptic number.

21152421350 is a deficient number, since it is larger than the sum of its proper divisors (18665108290).

21152421350 is a wasteful number, since it uses less digits than its factorization.

21152421350 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5097064 (or 5097059 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21152421350 its reverse (5312425112), we get a palindrome (26464846462).

The spelling of 21152421350 in words is "twenty-one billion, one hundred fifty-two million, four hundred twenty-one thousand, three hundred fifty".