21434020250000 has 140 divisors (see below), whose sum is σ = 52684668440112. Its totient is φ = 8445637200000.

The previous prime is 21434020249997. The next prime is 21434020250009. The reversal of 21434020250000 is 5202043412.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (21434020250009) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 16110179 + ... + 17389821.

Almost surely, 2^{21434020250000} is an apocalyptic number.

21434020250000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21434020250000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26342334220056).

21434020250000 is an abundant number, since it is smaller than the sum of its proper divisors (31250648190112).

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

21434020250000 is an frugal number, since it uses more digits than its factorization.

21434020250000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279748 (or 1279717 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 23.

Adding to 21434020250000 its reverse (5202043412), we get a palindrome (21439222293412).

The spelling of 21434020250000 in words is "twenty-one trillion, four hundred thirty-four billion, twenty million, two hundred fifty thousand".