421023661554 has 64 divisors (see below), whose sum is σ = 864836517888. Its totient is φ = 136561488000.

The previous prime is 421023661493. The next prime is 421023661573. The reversal of 421023661554 is 455166320124.

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, 244354137 + ... + 244355859.

It is an arithmetic number, because the mean of its divisors is an integer number (13513070592).

Almost surely, 2^421023661554 is an apocalyptic number.

421023661554 is an abundant number, since it is smaller than the sum of its proper divisors (443812856334).

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

421023661554 is a wasteful number, since it uses less digits than its factorization.

421023661554 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3783.

The product of its (nonzero) digits is 172800, while the sum is 39.

Adding to 421023661554 its reverse (455166320124), we get a palindrome (876189981678).

The spelling of 421023661554 in words is "four hundred twenty-one billion, twenty-three million, six hundred sixty-one thousand, five hundred fifty-four".