21142101442 has 96 divisors (see below), whose sum is σ = 42797595456. Its totient is φ = 7718860800.

The previous prime is 21142101427. The next prime is 21142101457. The reversal of 21142101442 is 24410124112.

It is an interprime number because it is at equal distance from previous prime (21142101427) and next prime (21142101457).

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4414173 + ... + 4418959.

It is an arithmetic number, because the mean of its divisors is an integer number (445808286).

Almost surely, 2^21142101442 is an apocalyptic number.

21142101442 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

21142101442 is an abundant number, since it is smaller than the sum of its proper divisors (21655494014).

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

21142101442 is a wasteful number, since it uses less digits than its factorization.

21142101442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5072 (or 5065 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 22.

Adding to 21142101442 its reverse (24410124112), we get a palindrome (45552225554).

The spelling of 21142101442 in words is "twenty-one billion, one hundred forty-two million, one hundred one thousand, four hundred forty-two".