20421464112550 has 96 divisors (see below), whose sum is σ = 39695803993440. Its totient is φ = 7810067865600.

The previous prime is 20421464112547. The next prime is 20421464112551. The reversal of 20421464112550 is 5521146412402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20421464112551) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 20121589 + ... + 21112111.

It is an arithmetic number, because the mean of its divisors is an integer number (413497958265).

Almost surely, 2^{20421464112550} is an apocalyptic number.

20421464112550 is a deficient number, since it is larger than the sum of its proper divisors (19274339880890).

20421464112550 is a wasteful number, since it uses less digits than its factorization.

20421464112550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990778 (or 990773 counting only the distinct ones).

The product of its (nonzero) digits is 76800, while the sum is 37.

The spelling of 20421464112550 in words is "twenty trillion, four hundred twenty-one billion, four hundred sixty-four million, one hundred twelve thousand, five hundred fifty".