1021422687 has 4 divisors (see below), whose sum is σ = 1361896920. Its totient is φ = 680948456.

The previous prime is 1021422673. The next prime is 1021422737. The reversal of 1021422687 is 7862241201.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1021422687 - 2⁸ = 1021422431 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021422637) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 170237112 + ... + 170237117.

It is an arithmetic number, because the mean of its divisors is an integer number (340474230).

Almost surely, 2^1021422687 is an apocalyptic number.

1021422687 is a deficient number, since it is larger than the sum of its proper divisors (340474233).

1021422687 is an equidigital number, since it uses as much as digits as its factorization.

1021422687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340474232.

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 1021422687 is about 31959.7041131485. The cubic root of 1021422687 is about 1007.0905016278.

Adding to 1021422687 its reverse (7862241201), we get a palindrome (8883663888).

The spelling of 1021422687 in words is "one billion, twenty-one million, four hundred twenty-two thousand, six hundred eighty-seven".