21239770350144 has 56 divisors (see below), whose sum is σ = 56246668771360. Its totient is φ = 7073652409344.

The previous prime is 21239770350077. The next prime is 21239770350167. The reversal of 21239770350144 is 44105307793212.

It is a super-2 number, since 2×21239770350144² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 21239770350093 and 21239770350102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48775174 + ... + 49208709.

Almost surely, 2^{21239770350144} is an apocalyptic number.

21239770350144 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21239770350144 is an abundant number, since it is smaller than the sum of its proper divisors (35006898421216).

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

21239770350144 is a wasteful number, since it uses less digits than its factorization.

21239770350144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97985027 (or 97985017 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 48.

The spelling of 21239770350144 in words is "twenty-one trillion, two hundred thirty-nine billion, seven hundred seventy million, three hundred fifty thousand, one hundred forty-four".