1542947021 has 8 divisors (see below), whose sum is σ = 1923674304. Its totient is φ = 1202296320.

The previous prime is 1542947017. The next prime is 1542947023. The reversal of 1542947021 is 1207492451.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1542947021 - 2² = 1542947017 is a prime.

It is a super-2 number, since 2×1542947021² = 4761371019225548882, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1542947023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10019060 + ... + 10019213.

It is an arithmetic number, because the mean of its divisors is an integer number (240459288).

Almost surely, 2^1542947021 is an apocalyptic number.

1542947021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1542947021 is a deficient number, since it is larger than the sum of its proper divisors (380727283).

1542947021 is a wasteful number, since it uses less digits than its factorization.

1542947021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20038291.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 1542947021 is about 39280.3643185753. The cubic root of 1542947021 is about 1155.5365088046.

The spelling of 1542947021 in words is "one billion, five hundred forty-two million, nine hundred forty-seven thousand, twenty-one".