21514451143220 has 24 divisors (see below), whose sum is σ = 51634682744064. Its totient is φ = 7376383249056.

The previous prime is 21514451143189. The next prime is 21514451143223. The reversal of 21514451143220 is 2234115441512.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21514451143223) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76837325372 + ... + 76837325651.

It is an arithmetic number, because the mean of its divisors is an integer number (2151445114336).

Almost surely, 2^{21514451143220} is an apocalyptic number.

21514451143220 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21514451143220 is an abundant number, since it is smaller than the sum of its proper divisors (30120231600844).

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

21514451143220 is a wasteful number, since it uses less digits than its factorization.

21514451143220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 153674651039 (or 153674651037 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 35.

Adding to 21514451143220 its reverse (2234115441512), we get a palindrome (23748566584732).

The spelling of 21514451143220 in words is "twenty-one trillion, five hundred fourteen billion, four hundred fifty-one million, one hundred forty-three thousand, two hundred twenty".