21502021354 has 8 divisors (see below), whose sum is σ = 35185125888. Its totient is φ = 9773646060.

The previous prime is 21502021349. The next prime is 21502021459. The reversal of 21502021354 is 45312020512.

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

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, 488682282 + ... + 488682325.

It is an arithmetic number, because the mean of its divisors is an integer number (4398140736).

Almost surely, 2^21502021354 is an apocalyptic number.

21502021354 is a deficient number, since it is larger than the sum of its proper divisors (13683104534).

21502021354 is a wasteful number, since it uses less digits than its factorization.

21502021354 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 977364620.

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 21502021354 its reverse (45312020512), we get a palindrome (66814041866).

The spelling of 21502021354 in words is "twenty-one billion, five hundred two million, twenty-one thousand, three hundred fifty-four".