21354671372450 has 48 divisors (see below), whose sum is σ = 42775967241000. Its totient is φ = 7884632555520.

The previous prime is 21354671372429. The next prime is 21354671372459. The reversal of 21354671372450 is 5427317645312.

It can be written as a sum of positive squares in 12 ways, for example, as 9601204213561 + 11753467158889 = 3098581^2 + 3428333^2 .

It is a Harshad number since it is a multiple of its sum of digits (50).

It is not an unprimeable number, because it can be changed into a prime (21354671372459) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 32287676 + ... + 32942424.

Almost surely, 2^{21354671372450} is an apocalyptic number.

21354671372450 is an abundant number, since it is smaller than the sum of its proper divisors (21421295868550).

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

21354671372450 is a wasteful number, since it uses less digits than its factorization.

21354671372450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 704951 (or 704946 counting only the distinct ones).

The product of its (nonzero) digits is 4233600, while the sum is 50.

The spelling of 21354671372450 in words is "twenty-one trillion, three hundred fifty-four billion, six hundred seventy-one million, three hundred seventy-two thousand, four hundred fifty".