1021123642 has 24 divisors (see below), whose sum is σ = 1943736480. Its totient is φ = 397839960.

The previous prime is 1021123637. The next prime is 1021123651. The reversal of 1021123642 is 2463211201.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 472542 + ... + 474697.

It is an arithmetic number, because the mean of its divisors is an integer number (80989020).

Almost surely, 2^1021123642 is an apocalyptic number.

1021123642 is a deficient number, since it is larger than the sum of its proper divisors (922612838).

1021123642 is a wasteful number, since it uses less digits than its factorization.

1021123642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 947266 (or 947259 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 22.

The square root of 1021123642 is about 31955.0253011948. The cubic root of 1021123642 is about 1006.9922090605.

Adding to 1021123642 its reverse (2463211201), we get a palindrome (3484334843).

The spelling of 1021123642 in words is "one billion, twenty-one million, one hundred twenty-three thousand, six hundred forty-two".