142070821 has 2 divisors, whose sum is σ = 142070822. Its totient is φ = 142070820.

The previous prime is 142070777. The next prime is 142070833. The reversal of 142070821 is 128070241.

It is a happy number.

142070821 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 141348321 + 722500 = 11889^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 142070821 - 2¹³ = 142062629 is a prime.

It is a super-2 number, since 2×142070821² = 40368236359228082, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (142070881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 71035410 + 71035411.

It is an arithmetic number, because the mean of its divisors is an integer number (71035411).

Almost surely, 2^142070821 is an apocalyptic number.

It is an amenable number.

142070821 is a deficient number, since it is larger than the sum of its proper divisors (1).

142070821 is an equidigital number, since it uses as much as digits as its factorization.

142070821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 896, while the sum is 25.

The square root of 142070821 is about 11919.3465005427. The cubic root of 142070821 is about 521.7970627204.

Subtracting from 142070821 its sum of digits (25), we obtain a triangular number (142070796 = T₁₆₈₅₆).

The spelling of 142070821 in words is "one hundred forty-two million, seventy thousand, eight hundred twenty-one".