21275156142 has 32 divisors (see below), whose sum is σ = 47737148160. Its totient is φ = 7022865240.

The previous prime is 21275156137. The next prime is 21275156143. The reversal of 21275156142 is 24165157212.

21275156142 is a `hidden beast` number, since 2 + 1 + 2 + 7 + 51 + 561 + 42 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 21275156097 and 21275156106.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21275156143) 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, 1906984 + ... + 1918107.

It is an arithmetic number, because the mean of its divisors is an integer number (1491785880).

Almost surely, 2^21275156142 is an apocalyptic number.

21275156142 is an abundant number, since it is smaller than the sum of its proper divisors (26461992018).

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

21275156142 is a wasteful number, since it uses less digits than its factorization.

21275156142 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3825205 (or 3825199 counting only the distinct ones).

The product of its digits is 33600, while the sum is 36.

The spelling of 21275156142 in words is "twenty-one billion, two hundred seventy-five million, one hundred fifty-six thousand, one hundred forty-two".