1021653542 has 64 divisors (see below), whose sum is σ = 1929844224. Its totient is φ = 394917120.

The previous prime is 1021653533. The next prime is 1021653553. The reversal of 1021653542 is 2453561201.

1021653542 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×1021653542² = 2087551919762291528, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1740173 + ... + 1740759.

It is an arithmetic number, because the mean of its divisors is an integer number (30153816).

Almost surely, 2^1021653542 is an apocalyptic number.

1021653542 is a deficient number, since it is larger than the sum of its proper divisors (908190682).

1021653542 is a wasteful number, since it uses less digits than its factorization.

1021653542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 813.

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1021653542 is about 31963.3155664427. The cubic root of 1021653542 is about 1007.1663678249.

The spelling of 1021653542 in words is "one billion, twenty-one million, six hundred fifty-three thousand, five hundred forty-two".