21142999987228 has 48 divisors (see below), whose sum is σ = 44576750373120. Its totient is φ = 8571807154944.

The previous prime is 21142999987199. The next prime is 21142999987229. The reversal of 21142999987228 is 82278999924112.

It is a Smith number, since the sum of its digits (73) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21142999987229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28730701 + ... + 29457412.

It is an arithmetic number, because the mean of its divisors is an integer number (928682299440).

Almost surely, 2^{21142999987228} is an apocalyptic number.

21142999987228 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

21142999987228 is an abundant number, since it is smaller than the sum of its proper divisors (23433750385892).

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

21142999987228 is a wasteful number, since it uses less digits than its factorization.

21142999987228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58188826 (or 58188824 counting only the distinct ones).

The product of its digits is 188116992, while the sum is 73.

The spelling of 21142999987228 in words is "twenty-one trillion, one hundred forty-two billion, nine hundred ninety-nine million, nine hundred eighty-seven thousand, two hundred twenty-eight".