215542420000 has 60 divisors (see below), whose sum is σ = 530266733766. Its totient is φ = 86216960000.

The previous prime is 215542419979. The next prime is 215542420057. The reversal of 215542420000 is 24245512.

It can be written as a sum of positive squares in 5 ways, for example, as 18573328656 + 196969091344 = 136284^2 + 443812^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 5368561 + ... + 5408560.

Almost surely, 2^215542420000 is an apocalyptic number.

215542420000 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

215542420000 is an abundant number, since it is smaller than the sum of its proper divisors (314724313766).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215542420000 is an equidigital number, since it uses as much as digits as its factorization.

215542420000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10777151 (or 10777128 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 25.

Adding to 215542420000 its reverse (24245512), we get a palindrome (215566665512).

The spelling of 215542420000 in words is "two hundred fifteen billion, five hundred forty-two million, four hundred twenty thousand".