215758021142 has 16 divisors (see below), whose sum is σ = 324491851680. Its totient is φ = 107594137728.

The previous prime is 215758021133. The next prime is 215758021169. The reversal of 215758021142 is 241120857512.

It is a super-2 number, since 2×215758021142² (a number of 23 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 215758021096 and 215758021105.

It is a congruent number.

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, 11691959 + ... + 11710397.

It is an arithmetic number, because the mean of its divisors is an integer number (20280740730).

Almost surely, 2^215758021142 is an apocalyptic number.

215758021142 is a deficient number, since it is larger than the sum of its proper divisors (108733830538).

215758021142 is a wasteful number, since it uses less digits than its factorization.

215758021142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33575.

The product of its (nonzero) digits is 44800, while the sum is 38.

Adding to 215758021142 its reverse (241120857512), we get a palindrome (456878878654).

The spelling of 215758021142 in words is "two hundred fifteen billion, seven hundred fifty-eight million, twenty-one thousand, one hundred forty-two".