21154522403050 has 72 divisors (see below), whose sum is σ = 42540186714732. Its totient is φ = 7820927136000.

The previous prime is 21154522403041. The next prime is 21154522403051. The reversal of 21154522403050 is 5030422545112.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 1210274521 + 21153312128529 = 34789^2 + 4599273^2 .

It is a super-2 number, since 2×21154522403050² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21154522402997 and 21154522403015.

It is not an unprimeable number, because it can be changed into a prime (21154522403051) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 13552581 + ... + 15032680.

Almost surely, 2^{21154522403050} is an apocalyptic number.

21154522403050 is an abundant number, since it is smaller than the sum of its proper divisors (21385664311682).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21154522403050 is a wasteful number, since it uses less digits than its factorization.

21154522403050 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28585352 (or 28585328 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 34.

Adding to 21154522403050 its reverse (5030422545112), we get a palindrome (26184944948162).

The spelling of 21154522403050 in words is "twenty-one trillion, one hundred fifty-four billion, five hundred twenty-two million, four hundred three thousand, fifty".